Expanded Owens Valley Solar Array: Difference between revisions

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[[File:Eovsa1.png|border|text-top|800px]]
[[File:Eovsa1.png|border|text-top|800px]]


<big>[http://ovsa.njit.edu/ EOVSA] (Expanded Owens Valley Solar Array) is a new solar-dedicated radio interferometer operated by the New Jersey Institute of Technology. This wiki serves as the site for EOVSA documentation.  </big>
<big>[http://ovsa.njit.edu/ EOVSA] (Expanded Owens Valley Solar Array) is a solar-dedicated radio interferometer operated by the New Jersey Institute of Technology and serving as a '''National Science Foundation Geospace Facility'''. [[File:NSF.jpg|70px]]
<pre>Operation of EOVSA is supported by the National Science Foundation under Grant No. AGS-2130832. Any opinions, findings, and conclusions or  recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science  Foundation. </pre>
This wiki serves as the site for EOVSA documentation.  </big>
 
[[File:OVRO-LWA1.png|border|text-top|800px]]
 
<big>OVRO-LWA (Owens Valley Radio Observatory Long Wavelength Array) is an all-sky imager that has a new solar-dedicated spectroscopic imaging mode. OVRO-LWA is a multi-institutional collaboration led by Caltech. NJIT Solar Radio Group is leading its solar-mode development and science. At the bottom of this page are new links for that facility.  </big>
 
== EOVSA Flare List ==
 
* [https://ovsa.njit.edu/flarelist Query EOVSA Flare list]
* List of EOVSA flares in separate years: [[2024]], [[2023]], [[2022]], [[2021]], [[2020]], [[2019]], [[2017]]
 
== Using EOVSA Data  ==
* <big>[[EOVSA Data Products]]</big>: An introduction to standard EOVSA spectrogram and spectral image products with example scripts for reading and plotting.
* <big>[[EOVSA Data Policy]]</big>: Policy for using EOVSA data products.
* <big>Analysis Software</big>: These are for in-depth use of EOVSA data (from calibrated visibilities) and tools for quantitative analysis. 
** [https://github.com/suncasa/suncasa SunCASA] A wrapper around [https://casa.nrao.edu/ CASA (the Common Astronomy Software Applications package)] for synthesis imaging and visualizing solar spectral imaging data. CASA is one of the leading software tool for "supporting the data post-processing needs of the next generation of radio astronomical telescopes such as ALMA and VLA", an international effort led by the [https://public.nrao.edu/ National Radio Astronomy Observatory]. The current version of CASA uses Python (2.7) interface. More information about CASA can be found on [https://casa.nrao.edu/ NRAO's CASA website ]. Note, CASA is available ONLY on UNIX-BASED PLATFORMS (and therefore, so is SunCASA).
** [https://github.com/Gelu-Nita/GSFIT GSFIT] A IDL-widget(GUI)-based spectral fitting package called gsfit, which provides a user-friendly display of EOVSA image cubes and an interface to fast fitting codes (via platform-dependent shared-object libraries).
** [https://github.com/suncasa/pygsfit pyGSFIT] A Python-widget(pyQT)-based spectral fitting package, which provides a user-friendly display of EOVSA image cubes, spatially resolved spectra, and an interface to scipy-based fitting codes.
** [[Spectrogram Software]]
** [[Mapping Software]]
* <big>Data Analysis Guides (for those who start from raw data) </big>
<!--** <big>[[EOVSA Data Analysis Tutorial 2022]]</big> and <big>[https://colab.research.google.com/drive/19NQb6Emb9HvKX4QHq9ZYCP3RM6nT7sDL#scrollTo=cLdDVptBGG-X EOVSA Workspace]</big> at [https://sphere.boulder.swri.edu/ SPHERE 2022 Workshop]-->
<!--** <big>[https://colab.research.google.com/drive/1lSLLxgOG6b8kgu9Sk6kSKvrViyubnXG6?usp=sharing#scrollTo=xbXyyLmCFCGL EOVSA Data Analysis Tutorial at RHESSI 19 Workshop]</big>-->
<!--** <big>[[EOVSA Data Analysis Tutorial]]</big> at [http://rhessi18.umn.edu/ RHESSI XVIII Workshop]-->
<!-- ** [[Self-Calibrating Flare Data]] Example script and guides for self-calibrating EOVSA flare data (to be completed)-->
<!-- ** [[Imaging]] -->
<!-- ** [[Flare Imaging]] -->
**[[Tohban Guide to Self Calibration and Imaging for EOVSA]] Step-to-step guide for manually making images from raw visibility data.
**[[EOVSA flare pipeline]] Description of the EOVSA flare pipeline and tutorial for running it to produce quicklook images.
<!-- ** [[Imaging]] -->
<!-- ** [[Flare Imaging]] -->
 
* <big>EOVSA Modeling Guide</big>
**[[GX Simulator]]
 
* Other helpful links
** [https://casaguides.nrao.edu CASA Guides]
** [http://www.lmsal.com/solarsoft/ SolarSoft IDL]
** [http://www.atnf.csiro.au/computing/software/miriad/userguide/userhtml.html Miriad Guides]
** [https://sites.google.com/site/fgscodes/ Fast Gyrosynchrotron Codes (Alexey Kuznetsov's website)]
** [[Basic GitHub Tutorial]]
 
<!--* <big>[[EOVSA Imaging Workshop]]</big>-->
* <big>[[Full Disk Simulations]]</big>
* <big>[[All-Day Synthesis Issues]]</big>
* <big>[[Analyzing Pre-2017 Data]]</big>
* <big>[[Fixing Pipeline Problems pre-2021-Feb-07]]</big>


== EOVSA Documentation ==
== EOVSA Documentation ==
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** [[Dealing with Radio Frequency Interference]]
** [[Dealing with Radio Frequency Interference]]
** [[Switching between 200 MHz and 300 MHz Correlator]]
** [[Switching between 200 MHz and 300 MHz Correlator]]
** [[Observing in "Fast" Mode]]


* <big>Computer-Network</big>
* <big>Computer-Network</big>
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** [[27-m Antennas]]
** [[27-m Antennas]]


* <big>Software</big>
* <big>System Software</big>
** [[Calibration Database]]
** [[Calibration Database]]
** [[Stateframe Database]]
** [[Stateframe Database]]
** [[Database Maintenance]]
** [[Create CASA measurement sets]]
** [[Create CASA measurement sets]]


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**[[Total Power Calibration]]
**[[Total Power Calibration]]
**[[System Gain Calibration]]
**[[System Gain Calibration]]
**[[Antenna Position]] (Baseline Calibration)
**[[Reference Gain Calibration]]
**[[Reference Gain Calibration]]
**[[Daily Gain Calibration]]
**[[Daily Gain Calibration]]
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**[[Bandpass Calibration]]
**[[Bandpass Calibration]]
**[[Polarization Calibration]]
**[[Polarization Calibration]]
**[[Antenna Position]]
**[[Calibrator Survey]]
**[[Calibrator Survey]]
**[[Practical Calibration Tutorial]]


* <big>[[Starburst]]</big>
* <big>[[Starburst]]</big>


== Using EOVSA Data  ==


* <big>Software Basics</big>
== EOVSA System Software ==
** [https://casaguides.nrao.edu CASA Guides]
 
** [http://www.atnf.csiro.au/computing/software/miriad/userguide/userhtml.html Miriad Guides]
* LabVIEW software
** [http://www.lmsal.com/solarsoft/ SolarSoft IDL]
* Python code [https://github.com/dgary50/eovsa Github repository]
** [[Basic GitHub Tutorial]]
* [[Python3 Code Installation]]
 
== EOVSA Observing Log ==
[[2016 November]]; [[2016 December| December]]
 
[[2017 January]]; [[2017 February | February]]; [[2017 March | March]]; [[2017 April | April]]; [[2017 May | May]]; [[2017 June | June]];
[[2017 July | July]]; [[2017 August | August]]; [[2017 September | September]]; [[2017 October | October]]; [[2017 November | November]]; [[2017 December | December]]
 
[[2018 January]]; [[2018 February | February]]; [[2018 March | March]]; [[2018 April | April]]; [[2018 May | May]]; [[2018 June | June]];
[[2018 July | July]]; [[2018 August | August]]; [[2018 September | September]]; [[2018 October | October]]; [[2018 November | November]]; [[2018 December | December]]
 
[[2019 January]]; [[2019 February | February]]; [[2019 March | March]]; [[2019 April | April]]; [[2019 May | May]]; [[2019 June | June]];
[[2019 July | July]]; [[2019 August | August]]; [[2019 September | September]]; [[2019 October | October]]; [[2019 November | November]]; [[2019 December | December]]
 
[[2020 January]]; [[2020 February | February]]; [[2020 March | March]]; [[2020 April | April]]; [[2020 May | May]]; [[2020 June | June]];
[[2020 July | July]]; [[2020 August | August]]; [[2020 September | September]]; [[2020 October | October]]; [[2020 November | November]]; [[2020 December | December]]
 
[[2021 January]]; [[2021 February | February]]; [[2021 March | March]]; [[2021 April | April]]; [[2021 May | May]]; [[2021 June | June]];
[[2021 July | July]]; [[2021 August | August]]; [[2021 September | September]]; [[2021 October | October]]; [[2021 November | November]]; [[2021 December | December]]
 
[[2022 SQL Outage]]
 
[[2023 January]]; [[2023 February | February]]; [[2023 March | March]]; [[2023 April | April]]; [[2023 May | May]]; [[2023 June | June]];
[[2023 July | July]]; [[2023 August | August]]; [[2023 September | September]]; [[2023 October | October]]; [[2023 November | November]]; [[2023 December | December]]


* <big>EOVSA Data Analysis Guide</big>
[[2024 January]]; [[2024 February | February]]; [[2024 March | March]];[[2024 April | April]];[[2024 May |May]]; [[2024 June | June]]; [[2024 July | July]];  [[2024 August | August]];
** [[Spectrogram Software]]
[[2024 September | September]]; [[2024 October | October]]; [[2024 November | November]]


== System Software ==
== EOVSA Scientist on Duty ==
* Scientist on Duty (SoD): EOVSA team members take turns and serve as an SoD to work with our onsite observatory staff on day-to-day observing. They are also responsible for monitoring solar activities and ensuring that the data we collect are of high quality.
* SoD observing logs:
** 2024: [https://docs.google.com/document/d/1QDWw5y4HpcE7CSpzXwftMqQT4FDgNJj-6fRrgWrqdug/edit?usp=sharing May (and before that)], [https://docs.google.com/document/d/1Rh2gYBV2E454xVYEv8jx5IXKd1N2Z05ns4dhI2XCE08/edit?usp=sharing June], [https://docs.google.com/document/d/1beUpp6rgwjqSxKbuHzXIR9hhPrGyi0j-SjtEIeav9Vg/edit?usp=sharing July], [https://docs.google.com/document/d/1pSzUXW5gd-4cZAR-gglTUVM_J2UHMa4wYJ2AzD4cdEo/edit?usp=sharing August], [https://docs.google.com/document/d/18pArAP0kRDhXHbty_y3TtrygmWkC2oLn-UD7njIpRIo/edit?usp=sharing September], [https://docs.google.com/document/d/1Qt6vhrqPAOG7W5Y_tLiod_QgNR1FDyzRxQcg6_oJQd4/edit?usp=sharing October], [https://docs.google.com/document/d/1pv9-Wne80FCrg0J5BkjOafmof_s3jlnc9HwyzWkIBfU/edit?usp=sharing November], [https://docs.google.com/document/d/1O5svOVwQZbUON1GMR_8nBR5LAL0M8RM2_zWW4oeBiLk/edit?usp=sharing December]
* SoD instructions:
** Daily routines: see [https://docs.google.com/document/d/1_iGnMRRrvb85Z0vT8-LzgQmCOKDSATEuQ0vTsn2C-dc/edit?usp=sharing SoD Routines] for detailed instructions.
** Instructions for [[making quick-look flare spectrograms and movies]]


* LabVIEW software
==OVRO-LWA Solar-Dedicated Spectroscopic Imager==
* Python code [https://github.com/dgary50/eovsa Github repository]
The OVRO-LWA (Owens Valley Radio Observatory Long Wavelength Array) has recently been upgraded to include a solar-dedicated beam and two solar imaging modes (slow visibilities of 352 antennas with a 10-s cadence, and fast visibilities of 48 antennas with a 0.1-s cadence).  The large collecting area and excellent calibration provide unprecedented high-sensitivity imaging of the quiet Sun and bursts.  The array is currently in commissioning and observations are not yet continuous, but they are becoming more so.  See the daily realtime data at http://ovsa.njit.edu/status.php for '''real-time display of the spectrogram and a selection of images''', both updated on a 1-min cadence.


== Observing Log ==
===Solar-Dedicated Modes===
[[2016 November]]
* Beamformer: the beamformer uses the 256 core antennas to form a synthesized beam of more than 1 degree in size that tracks the Sun from sunrise to sunset.  This permits a continuous record of the full-Stokes total flux (without spatial resolution) of the Sun (a dynamic spectrum) with 24 kHz frequency resolution (3072 frequencies from 15-90 MHz) and as low as 1 ms time resolution.


[[2016 December]]
* Slow Visibility Imaging: in this mode, the entire 352-element array is interferometrically correlated to provide visibilities for imaging at all 3072 frequencies at 10-s time resolution.  This is ideal for imaging quiet Sun and slowly-varying emission such as coronal mass ejections and active region variability.


[[2017 January]]
* Fast Visibility Imaging: in this mode, a subset of 48 antennas (chosen to include mainly outer antennas to maintain good spatial resolution) is interferometrically correlated to provide visibilities for imaging at 768 frequencies (96 kHz frequency resolution) at 0.1-s time resolution.  This is ideal for imaging rapidly varying emission such as type II and type III bursts as well as many other solar spectral fine structures.


[[2017 February]]
===Inital Data Access===
In its current commissioning state, we try to run the beamformer and imaging pipeline every day in real-time since November 2023 (no latency for beamforming spectrograms and 5-10 min latency for images). Quicklook real-time spectrograms/images can be accessed from http://ovsa.njit.edu/status.php. To access data from previous days, use the following links (replace yyyymmdd with the date you desire):
* Quicklook beamformer total-power spectrograms: http://ovsa.njit.edu/lwa-data/1min_spectra/yyyymmdd/. Check this link for additional daily plots [[Daily OVRO-LWA Beamformer Data]].
* Quicklook multi-frequency movies at 1-min cadence: http://ovsa.njit.edu/lwa-data/1min_images/yyyymmdd/movie_yyyy-mm-dd.html


[[2017 March]]
Note our pipeline processing development is still in the early phase. For example, absolute flux calibrations have not been done for the beamformer spectrograms. Also, artificial effects (including ionospheric refraction effects) are present in the images that cause distortions/shifts. We caution interested users only to consider them for quick-look purposes at this point. Please contact the EOVSA PIs (Dale Gary, Bin Chen) if you intend to use them for science.


[[2017 April]]
===OVRO-LWA Operation Notes===


[[2017 May]]
[[OVRO-LWA Operation Notes]]


== Tohbans ==
== Tohbans ==
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[[Tohban Records]]
[[Tohban Records]]


== Flare List ==
[[Owen's Notes]]
 
[[Caius' Notes]]
 
[[Tohban EOVSA Imaging Tutorial A-Z]]
 
[[Tohban OVRO-LWA Imaging Tutorial]]
 
[[Tohban Guide to Self Calibration and Imaging for EOVSA]]
 
[[Guide to Upgrade SolarSoft(SSW)]]
 
== EOVSA Publications ==
Here is a (partial) list of publications that utilize EOVSA data. See also the collection of EOVSA publications at [https://ui.adsabs.harvard.edu/public-libraries/eQ7HfPkySqydu-B8BCt6QQ this NASA/ADS Library].
; 2024
: Collier, H., Hayes, L. A., Yu, S., Battaglia, A. F., Ashfield, W., Polito, V., Harra, L. K., & Krucker, S. (2024), arXiv e-prints, arXiv:2402.10546. [https://ui.adsabs.harvard.edu/abs/2024arXiv240210546C “Localising pulsations in the hard X-ray and microwave emission of an X-class flare”]
: Saqri, J., Veronig, A. M., Battaglia, A. F., Dickson, E. C. M., Gary, D. E., & Krucker, S. (2024), Astronomy and Astrophysics, 683, A41. [https://ui.adsabs.harvard.edu/abs/2024A&A...683A..41S "Efficiency of solar microflares in accelerating electrons when rooted in a sunspot"]
; 2023
: Tan, B., Yan, Y., Huang, J., Zhang, Y., Tan, C., & Zhu, X. (2023), Advances in Space Research, 72, 5563. [https://ui.adsabs.harvard.edu/abs/2023AdSpR..72.5563T "The physics of solar spectral imaging observations in dm-cm wavelengths and the application on space weather"]
 
: Li, D., Li, Z., Shi, F., Su, Y., Chen, W., Yu, F., Li, C., Qiu, Y., Huang, Y., & Ning, Z. (2023), Astronomy and Astrophysics, 680, L15. [https://ui.adsabs.harvard.edu/abs/2023A&A...680L..15L "Observational signature of continuously operating drivers of decayless kink oscillation"]
 
: Wang, M., Chen, B., Yu, S., Gary, D. E., Lee, J., Wang, H., & Cohen, C. (2023), The Astrophysical Journal, 954, 32. [https://ui.adsabs.harvard.edu/abs/2023ApJ...954...32W "The Solar Origin of an In Situ Type III Radio Burst Event"]
 
: Gary, D. E. (2023), Annual Review of Astronomy and Astrophysics, 61, 427. [https://ui.adsabs.harvard.edu/abs/2023ARA&A..61..427G "New Insights from Imaging Spectroscopy of Solar Radio Emission"]
 
: Nita, G. M., Fleishman, G. D., Kuznetsov, A. A., Anfinogentov, S. A., Stupishin, A. G., Kontar, E. P., Schonfeld, S. J., Klimchuk, J. A., & Gary, D. E. (2023), The Astrophysical Journal Supplement Series, 267, 6. [https://ui.adsabs.harvard.edu/abs/2023ApJS..267....6N "Data-constrained Solar Modeling with GX Simulator"]
 
: Song, D.-C., Tian, J., Li, Y., Ding, M. D., Su, Y., Yu, S., Hong, J., Qiu, Y., Rao, S., Liu, X., Li, Q., Chen, X., Li, C., & Fang, C. (2023), The Astrophysical Journal, 952, L6. [https://ui.adsabs.harvard.edu/abs/2023ApJ...952L...6S "Spectral Observations and Modeling of a Solar White-light Flare Observed by CHASE"]
 
: Mondal, S., Chen, B., & Yu, S. (2023), The Astrophysical Journal, 949, 56. [https://ui.adsabs.harvard.edu/abs/2023ApJ...949...56M "Multifrequency Microwave Imaging of Weak Transients from the Quiet Solar Corona"]
 
: Kontar, E. P., Emslie, A. G., Motorina, G. G., & Dennis, B. R. (2023), The Astrophysical Journal, 947, L13. [https://ui.adsabs.harvard.edu/abs/2023ApJ...947L..13K "The Efficiency of Electron Acceleration during the Impulsive Phase of a Solar Flare"]
 
: Saqri, J., Veronig, A. M., Dickson, E. C. M., Podladchikova, T., Warmuth, A., Xiao, H., Gary, D. E., Battaglia, A. F., & Krucker, S. (2023), Astronomy and Astrophysics, 672, A23. [https://ui.adsabs.harvard.edu/abs/2023A&A...672A..23S "Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare"]
; 2022
 
: Kou, Y., Cheng, X., Wang, Y., Yu, S., Chen, B., Kontar, E. P., & Ding, M. (2022), Nature Communications, 13, 7680. [https://ui.adsabs.harvard.edu/abs/2022NatCo..13.7680K "Microwave imaging of quasi-periodic pulsations at flare current sheet"]
 
: Chertok, I. M. (2022), Monthly Notices of the Royal Astronomical Society, 517, 2709. [https://ui.adsabs.harvard.edu/abs/2022MNRAS.517.2709C "On some features of the solar proton event on 2021 October 28 - GLE73"]
 
: Lörinčík, J., Polito, V., De Pontieu, B., Yu, S., & Freij, N. (2022), Frontiers in Astronomy and Space Sciences, 9, 334. [https://ui.adsabs.harvard.edu/abs/2022FrASS...940945L "Rapid variations of Si IV spectra in a flare observed by interface region imaging spectrograph at a sub-second cadence"]
 
: Klein, K.-L., Musset, S., Vilmer, N., Briand, C., Krucker, S., Francesco Battaglia, A., Dresing, N., Palmroos, C., & Gary, D. E. (2022), Astronomy and Astrophysics, 663, A173. [https://ui.adsabs.harvard.edu/abs/2022A&A...663A.173K "The relativistic solar particle event on 28 October 2021: Evidence of particle acceleration within and escape from the solar corona"]
 
: Fleishman, G. D., Nita, G. M., Chen, B., Yu, S., & Gary, D. E. (2022), Nature, 606, 674. [https://ui.adsabs.harvard.edu/abs/2022Natur.606..674F "Solar flare accelerates nearly all electrons in a large coronal volume"]
 
: Li, X., Guo, F., Chen, B., Shen, C., & Glesener, L. (2022), The Astrophysical Journal, 932, 92. [https://ui.adsabs.harvard.edu/abs/2022ApJ...932...92L "Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10th Solar Flare"]
 
: Zhang, J., Chen, B., Yu, S., Tian, H., Wei, Y., Chen, H., Tan, G., Luo, Y., & Chen, X. (2022), The Astrophysical Journal, 932, 53. [https://ui.adsabs.harvard.edu/abs/2022ApJ...932...53Z "Implications for Additional Plasma Heating Driving the Extreme-ultraviolet Late Phase of a Solar Flare with Microwave Imaging Spectroscopy"]
 
: Liu, N., Jing, J., Xu, Y., & Wang, H. (2022), The Astrophysical Journal, 930, 154. [https://ui.adsabs.harvard.edu/abs/2022ApJ...930..154L "Multi-instrument Comparative Study of Temperature, Number Density, and Emission Measure during the Precursor Phase of a Solar Flare"]
 
: López, F. M., Giménez de Castro, C. G., Mandrini, C. H., Simões, P. J. A., Cristiani, G. D., Gary, D. E., Francile, C., & Démoulin, P. (2022), Astronomy and Astrophysics, 657, A51. [https://ui.adsabs.harvard.edu/abs/2022A&A...657A..51L "A solar flare driven by thermal conduction observed in mid-infrared"]
 
: Unverferth, J., & Longcope, D. (2021), The Astrophysical Journal, 923, 248. [https://ui.adsabs.harvard.edu/abs/2021ApJ...923..248U "Examining Flux Tube Interactions as a Cause of Sub-alfvénic Outflow"]
;2021
 
: Wei, Y., Chen, B., Yu, S., Wang, H., Jing, J., & Gary, D. E. (2021), The Astrophysical Journal, 923, 213. [https://ui.adsabs.harvard.edu/abs/2021ApJ...923..213W "Coronal Magnetic Field Measurements along a Partially Erupting Filament in a Solar Flare"]
 
: Jing, J., Inoue, S., Lee, J., Li, Q., Nita, G. M., Xu, Y., Liu, C., Gary, D. E., & Wang, H. (2021), The Astrophysical Journal, 922, 108. [https://ui.adsabs.harvard.edu/abs/2021ApJ...922..108J "Understanding the Initiation of the M2.4 Flare on 2017 July 14"]
 
: Battaglia, A. F., Saqri, J., Massa, P., Perracchione, E., Dickson, E. C. M., Xiao, H., Veronig, A. M., Warmuth, A., Battaglia, M., Hurford, G. J., Meuris, A., Limousin, O., Etesi, L., Maloney, S. A., Schwartz, R. A., Kuhar, M., Schuller, F., Senthamizh Pavai, V., Musset, S., Ryan, D. F., Kleint, L., Piana, M., Massone, A. M., Benvenuto, F., Sylwester, J., Litwicka, M., Stȩślicki, M., Mrozek, T., Vilmer, N., Fárník, F., Kašparová, J., Mann, G., Gallagher, P. T., Dennis, B. R., Csillaghy, A., Benz, A. O., & Krucker, S. (2021), Astronomy and Astrophysics, 656, A4. [https://ui.adsabs.harvard.edu/abs/2021A&A...656A...4B "STIX X-ray microflare observations during the Solar Orbiter commissioning phase"]
 
: Shaik, S. B., & Gary, D. E. (2021), The Astrophysical Journal, 919, 44. [https://ui.adsabs.harvard.edu/abs/2021ApJ...919...44S "Implications of Flat Optically Thick Microwave Spectra in Solar Flares for Source Size and Morphology"]
 
: Kocharov, L., Omodei, N., Mishev, A., Pesce-Rollins, M., Longo, F., Yu, S., Gary, D. E., Vainio, R., & Usoskin, I. (2021), The Astrophysical Journal, 915, 12. [https://ui.adsabs.harvard.edu/abs/2021ApJ...915...12K "Multiple Sources of Solar High-energy Protons"]
 
: Chen, B., Battaglia, M., Krucker, S., Reeves, K. K., & Glesener, L. (2021), The Astrophysical Journal, 908, L55. [https://ui.adsabs.harvard.edu/abs/2021ApJ...908L..55C "Energetic Electron Distribution of the Coronal Acceleration Region: First Results from Joint Microwave and Hard X-Ray Imaging Spectroscopy"]
 
: Chhabra, S., Gary, D. E., Hallinan, G., Anderson, M. M., Chen, B., Greenhill, L. J., & Price, D. C. (2021), The Astrophysical Journal, 906, 132. [https://ui.adsabs.harvard.edu/abs/2021ApJ...906..132C "Imaging Spectroscopy of CME-associated Solar Radio Bursts using OVRO-LWA"]
;2020 and earlier
 
: Reeves, K. K., Polito, V., Chen, B., Galan, G., Yu, S., Liu, W., & Li, G. (2020), The Astrophysical Journal, 905, 165. [https://ui.adsabs.harvard.edu/abs/2020ApJ...905..165R "Hot Plasma Flows and Oscillations in the Loop-top Region During the 2017 September 10 X8.2 Solar Flare"]
 
: Nindos, A. (2020), Frontiers in Astronomy and Space Sciences, 7, 57. [https://ui.adsabs.harvard.edu/abs/2020FrASS...7...57N "Incoherent Solar Radio Emission"]
 
: Yu, S., Chen, B., Reeves, K. K., Gary, D. E., Musset, S., Fleishman, G. D., Nita, G. M., & Glesener, L. (2020), The Astrophysical Journal, 900, 17. [https://ui.adsabs.harvard.edu/abs/2020ApJ...900...17Y "Magnetic Reconnection during the Post-impulsive Phase of a Long-duration Solar Flare: Bidirectional Outflows as a Cause of Microwave and X-Ray Bursts"]
 
: Chen, B., Yu, S., Reeves, K. K., & Gary, D. E. (2020), The Astrophysical Journal, 895, L50. [https://ui.adsabs.harvard.edu/abs/2020ApJ...895L..50C "Microwave Spectral Imaging of an Erupting Magnetic Flux Rope: Implications for the Standard Solar Flare Model in Three Dimensions"]
 
: Kuroda, N., Fleishman, G. D., Gary, D. E., Nita, G. M., Chen, B., & Yu, S. (2020), Frontiers in Astronomy and Space Sciences, 7, 22. [https://ui.adsabs.harvard.edu/abs/2020FrASS...7...22K "Evolution of Flare-accelerated Electrons Quantified by Spatially Resolved Analysis"]
 
: Glesener, L., Krucker, S., Duncan, J., Hannah, I. G., Grefenstette, B. W., Chen, B., Smith, D. M., White, S. M., & Hudson, H. (2020), The Astrophysical Journal, 891, L34. [https://ui.adsabs.harvard.edu/abs/2020ApJ...891L..34G "Accelerated Electrons Observed Down to <7 keV in a NuSTAR Solar Microflare"]
 
: Karlický, M., Chen, B., Gary, D. E., Kašparová, J., & Rybák, J. (2020), The Astrophysical Journal, 889, 72. [https://ui.adsabs.harvard.edu/abs/2020ApJ...889...72K "Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare"]
 
: Fleishman, G. D., Gary, D. E., Chen, B., Kuroda, N., Yu, S., & Nita, G. M. (2020), Science, 367, 278. [https://ui.adsabs.harvard.edu/abs/2020Sci...367..278F "Decay of the coronal magnetic field can release sufficient energy to power a solar flare"]
 
: Chen, B., Shen, C., Gary, D. E., Reeves, K. K., Fleishman, G. D., Yu, S., Guo, F., Krucker, S., Lin, J., Nita, G. M., & Kong, X. (2020), Nature Astronomy, 4, 1140. [https://ui.adsabs.harvard.edu/abs/2020NatAs...4.1140C "Measurement of magnetic field and relativistic electrons along a solar flare current sheet"]
 
: Lee, J. (2018), Journal of Astronomy and Space Sciences, 35, 211. [https://ui.adsabs.harvard.edu/abs/2018JASS...35..211L "Analysis of Solar Microwave Burst Spectrum, I. Nonuniform Magnetic Field"]
 
: Gary, D. E., Bastian, T. S., Chen, B., Fleishman, G. D., & Glesener, L. (2018), Science with a Next Generation Very Large Array, 517, 99. [https://ui.adsabs.harvard.edu/abs/2018ASPC..517...99G "Radio Observations of Solar Flares"]
 
: Polito, V., Dudík, J., Kašparová, J., Dzifčáková, E., Reeves, K. K., Testa, P., & Chen, B. (2018), The Astrophysical Journal, 864, 63. [https://ui.adsabs.harvard.edu/abs/2018ApJ...864...63P "Broad Non-Gaussian Fe XXIV Line Profiles in the Impulsive Phase of the 2017 September 10 X8.3-class Flare Observed by Hinode/EIS"]
 
: Gary, D. E., Chen, B., Dennis, B. R., Fleishman, G. D., Hurford, G. J., Krucker, S., McTiernan, J. M., Nita, G. M., Shih, A. Y., White, S. M., & Yu, S. (2018), The Astrophysical Journal, 863, 83. [https://ui.adsabs.harvard.edu/abs/2018ApJ...863...83G "Microwave and Hard X-Ray Observations of the 2017 September 10 Solar Limb Flare"]
 
: Fleishman, G. D., Nita, G. M., Kuroda, N., Jia, S., Tong, K., Wen, R. R., & Zhizhuo, Z. (2018), The Astrophysical Journal, 859, 17. [https://ui.adsabs.harvard.edu/abs/2018ApJ...859...17F "Revealing the Evolution of Non-thermal Electrons in Solar Flares Using 3D Modeling"]
 
: Kuroda, N., Gary, D. E., Wang, H., Fleishman, G. D., Nita, G. M., & Jing, J. (2018), The Astrophysical Journal, 852, 32. [https://ui.adsabs.harvard.edu/abs/2018ApJ...852...32K "Three-dimensional Forward-fit Modeling of the Hard X-Ray and Microwave Emissions of the 2015 June 22 M6.5 Flare"]
 
: Wang, H., Liu, C., Ahn, K., Xu, Y., Jing, J., Deng, N., Huang, N., Liu, R., Kusano, K., Fleishman, G. D., Gary, D. E., & Cao, W. (2017), Nature Astronomy, 1, 0085. [https://ui.adsabs.harvard.edu/abs/2017NatAs...1E..85W "High-resolution observations of flare precursors in the low solar atmosphere"]
 
: Nita, G. M., Hickish, J., MacMahon, D., & Gary, D. E. (2016), Journal of Astronomical Instrumentation, 5, 1641009-7366. [https://ui.adsabs.harvard.edu/abs/2016JAI.....541009N "EOVSA Implementation of a Spectral Kurtosis Correlator for Transient Detection and Classification"]
 
: Nita, G. M., & Gary, D. E. (2016), Journal of Geophysical Research (Space Physics), 121, 7353. [https://ui.adsabs.harvard.edu/abs/2016JGRA..121.7353N "Measurement of duration and signal-to-noise ratio of astronomical transients using a Spectral Kurtosis spectrometer"]
 
: Wang, Z., Gary, D. E., Fleishman, G. D., & White, S. M. (2015), The Astrophysical Journal, 805, 93. [https://ui.adsabs.harvard.edu/abs/2015ApJ...805...93W "Coronal Magnetography of a Simulated Solar Active Region from Microwave Imaging Spectropolarimetry"]
 
: Gary, D. E., Fleishman, G. D., & Nita, G. M. (2013), Solar Physics, 288, 549. [https://ui.adsabs.harvard.edu/abs/2013SoPh..288..549G "Magnetography of Solar Flaring Loops with Microwave Imaging Spectropolarimetry"]
 
== VLA Flare List and Publications ==
See [http://www.ovsa.njit.edu/wiki/index.php/VLA_Data_Survey#List_of_Jansky_VLA_Solar_Observations this link] for a list of flare observations made by the [https://science.nrao.edu/facilities/vla/ Karl G. Jansky Very Large Array] (VLA). Below is a partial list of publications that utilize VLA solar data (see also [https://ui.adsabs.harvard.edu/public-libraries/ZwbjpLo9RS-viufWEoQ95Q this NASA/ADS Library]).
* [https://ui.adsabs.harvard.edu/abs/2022ApJ...940..137L/abstract Luo et al. (2022), ApJ, 940, 137] ''Multiple Regions of Nonthermal Quasiperiodic Pulsations during the Impulsive Phase of a Solar Flare''
* [https://ui.adsabs.harvard.edu/abs/2021ApJ...922..134B/abstract Battaglia et al. (2021), ApJ, 922, 134] ''Multiple Electron Acceleration Instances during a Series of Solar Microflares Observed Simultaneously at X-Rays and Microwaves''
* [https://ui.adsabs.harvard.edu/abs/2021ApJ...911....4L/abstract Luo et al. (2021), ApJ, 911, 4] ''Radio Spectral Imaging of an M8.4 Eruptive Solar Flare: Possible Evidence of a Termination Shock''
* [https://ui.adsabs.harvard.edu/abs/2021ApJ...910...40Z/abstract Zhang et al. (2021), ApJ, 910, 40] ''Multiwavelength Observations of the Formation and Eruption of a Complex Filament''
* [https://ui.adsabs.harvard.edu/abs/2020ApJ...904...94S/abstract Sharma et al. (2020), ApJ, 904, 94] ''Radio and X-Ray Observations of Short-lived Episodes of Electron Acceleration in a Solar Microflare''
* [https://ui.adsabs.harvard.edu/abs/2019ApJ...884...63C/abstract Chen et al. (2019), ApJ, 884, 63] ''Radio Spectroscopic Imaging of a Solar Flare Termination Shock: Split-band Feature as Evidence for Shock Compression''
* [https://ui.adsabs.harvard.edu/abs/2019ApJ...872...71Y/abstract Yu & Chen (2019), ApJ, 872, 71] ''Possible Detection of Subsecond-period Propagating Magnetohydrodynamics Waves in Post-reconnection Magnetic Loops during a Two-ribbon Solar Flare''
* [https://ui.adsabs.harvard.edu/abs/2018ApJ...866...62C/abstract Chen et al. (2018), ApJ, 866, 62] ''Magnetic Reconnection Null Points as the Origin of Semirelativistic Electron Beams in a Solar Jet
''
* [https://ui.adsabs.harvard.edu/abs/2017ApJ...848...77W/abstract Wang et al. (2016), ApJ, 848, 77] ''Dynamic Spectral Imaging of Decimetric Fiber Bursts in an Eruptive Solar Flare''
* [https://ui.adsabs.harvard.edu/abs/2015Sci...350.1238C/abstract Chen et al. (2015), Science, 350, 1238] ''Particle acceleration by a solar flare termination shock''
* [https://ui.adsabs.harvard.edu/abs/2014ApJ...794..149C/abstract Chen et al. (2014), ApJ, 794, 149] ''Direct Evidence of an Eruptive, Filament-hosting Magnetic Flux Rope Leading to a Fast Solar Coronal Mass Ejection''
* [https://ui.adsabs.harvard.edu/abs/2013ApJ...763L..21C/abstract Chen et al. (2013), ApJL, 763, 21] ''Tracing Electron Beams in the Sun's Corona with Radio Dynamic Imaging Spectroscopy''
 


{| class="wikitable" style="text-align: center; width: 800px; height: 200px;"
==Radio Data from Around The Heliosphere==
|-
* [http://ovsa.njit.edu//wiki/index.php/Radio_Data_from_Around_the_World#Radio_Data_Access '' Radio Data '']
| Date || RHESSI Time || RHESSI Lightcurve || XSP Data || RHESSI Coverage || RHESSI Energy Range (keV) || EOVSA Time
|-
| May 6, 2017  || 20:07:24 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/05/06/hsi_20170506_194540_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170506180511.png] || Yes || 6 - 12 || 20:09:49
|-
| May 5, 2017 || 22:56:29 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/05/05/hsi_20170505_214700_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170505223611.png] || Yes || 6 - 12 || 23:27:51
|-
| April 21, 2017 || 17:27:25 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/21/hsi_20170421_170640_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170421173511.png] || Yes || 6 - 12 || 17:26:51
|-
| April 20, 2017 || 21:21:00 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/20/hsi_20170420_204200_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170420205111.png] || Yes || 6 - 12 || 21:27:49
|-
| April 18, 2017 || 00:26:55 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/17/hsi_20170417_233740_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170417232011.png] || Yes || 6 - 12 || -
|-
| April 17, 2017 || 22:28:41 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/17/hsi_20170417_220320_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170417213511.png] || Yes || 6 - 12 || -
|-
| || 21:40:04 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/17/hsi_20170417_202920_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170417213511.png] || Yes || 6 - 12 || 21:38:51
|-
| || 01:31:18 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/17/hsi_20170417_013840_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170416232511.png] || No || || -
|-
| April 10, 2017 || 18:20:52 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/10/hsi_20170410_171800_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170410173511.png] || No || || 18:26:51
|-
| April 8, 2017 || 23:58:40 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/08/hsi_20170408_225240_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170408231011.png] || Yes || 6 - 12 || -
|-
| || 19:26:44 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/08/hsi_20170408_181000_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170408191511.png] || Yes || 6 - 12 || -
|-
| April 7, 2017 || 19:46:57 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/07/hsi_20170407_183600_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170407191511.png] || No || || 19:47:52
|-
| || 00:23:45 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/06/hsi_20170406_234500_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170406233011.png] || Yes || 12 - 25 || 00:23:52
|-
| April 4, 2017 || 23:42:10 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/04/hsi_20170404_230340_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170404231511.png] || Yes || 25 - 50 || 23:40:51
|-
| || 19:41:44 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/04/hsi_20170404_182100_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170404191511.png] || No || || 19:42:52
|-
| || 00:39:35 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/03/hsi_20170403_233020_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170403231511.png] || Yes || 12 - 25 || 00:37:49
|-
| April 3, 2017 || 22:55:45 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/03/hsi_20170403_215600_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170403213511.png] || Yes || 12 - 25 || -
|-
| || 20:12:00 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/03/hsi_20170403_184740_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170403191511.png] || No || || 20:11:53
|-
| || 01:00:44 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/02/hsi_20170402_235700_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170402213511.png] || Yes || 25 - 50 || 01:00:52
|-
| April 2, 2017 || 20:31:18 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/02/hsi_20170402_191420_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170402191511.png] || No || || 20:31:49
|-
| || 18:49:33 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/02/hsi_20170402_174020_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170402173511.png] || No || || 18:48:52
|-
| || 16:25:30 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/02/hsi_20170402_160600_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170402143211.png] || Yes || 12 - 25 || 16:24:50
|-
| April 1, 2017 || 23:08:10 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/01/hsi_20170401_224940_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170401213511.png] || Yes || 12 - 25 || 23:01:51
|-
| || 21:48:35 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/01/hsi_20170401_211520_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170401213511.png] || Yes || 50 - 100 || 21:46:51
|-
| || 19:57:23 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/01/hsi_20170401_194120_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170401191511.png] || Yes || 12 - 25 || 19:42:50
|-
| || 15:37:25 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/04/01/hsi_20170401_145840_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170401143743.png] || Yes || 12 - 25 || -
|-
| March 31, 2017 || 23:05:13 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/31/hsi_20170331_214220_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170331213511.png] || No || || 22:57:49
|-
| || 20:49:35 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/31/hsi_20170331_200820_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170331191511.png] || Yes || 6 - 12 || -
|-
| || 19:15:00 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/31/hsi_20170331_183400_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170331191511.png] || Yes || 6 - 12 ||
|-
| || 17:36:15 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/31/hsi_20170331_170000_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170331173511.png] || Yes || 12 - 25 ||
|-
| || 14:46:57 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/31/hsi_20170331_135120_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170331143511.png] || No || ||
|-
| March 29, 2017 || 23:27:10 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/29/hsi_20170329_223640_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170329213511.png] || Yes || 6 - 12 ||
|-
| March 28, 2017 || 00:25:30 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/27/hsi_20170327_233100_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170327213511.png] || Yes || 6 - 12 ||
|-
| March 25, 2017 || 23:34:44 || [http://hessi.ssl.berkeley.edu/hessidata/metadata/2017/03/25/hsi_20170325_225100_corrected_rate.png] || [http://ovsa.njit.edu/flaremon/XSP20170325213511.png] || Yes || 6 - 12 ||
|}

Latest revision as of 15:36, 2 November 2024

Eovsa1.png

EOVSA (Expanded Owens Valley Solar Array) is a solar-dedicated radio interferometer operated by the New Jersey Institute of Technology and serving as a National Science Foundation Geospace Facility. NSF.jpg 

Operation of EOVSA is supported by the National Science Foundation under Grant No. AGS-2130832. Any opinions, findings, and conclusions or  recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science  Foundation.

This wiki serves as the site for EOVSA documentation.

OVRO-LWA1.png

OVRO-LWA (Owens Valley Radio Observatory Long Wavelength Array) is an all-sky imager that has a new solar-dedicated spectroscopic imaging mode. OVRO-LWA is a multi-institutional collaboration led by Caltech. NJIT Solar Radio Group is leading its solar-mode development and science. At the bottom of this page are new links for that facility.

EOVSA Flare List

Using EOVSA Data

  • EOVSA Data Products: An introduction to standard EOVSA spectrogram and spectral image products with example scripts for reading and plotting.
  • EOVSA Data Policy: Policy for using EOVSA data products.
  • Analysis Software: These are for in-depth use of EOVSA data (from calibrated visibilities) and tools for quantitative analysis.
    • SunCASA A wrapper around CASA (the Common Astronomy Software Applications package) for synthesis imaging and visualizing solar spectral imaging data. CASA is one of the leading software tool for "supporting the data post-processing needs of the next generation of radio astronomical telescopes such as ALMA and VLA", an international effort led by the National Radio Astronomy Observatory. The current version of CASA uses Python (2.7) interface. More information about CASA can be found on NRAO's CASA website . Note, CASA is available ONLY on UNIX-BASED PLATFORMS (and therefore, so is SunCASA).
    • GSFIT A IDL-widget(GUI)-based spectral fitting package called gsfit, which provides a user-friendly display of EOVSA image cubes and an interface to fast fitting codes (via platform-dependent shared-object libraries).
    • pyGSFIT A Python-widget(pyQT)-based spectral fitting package, which provides a user-friendly display of EOVSA image cubes, spatially resolved spectra, and an interface to scipy-based fitting codes.
    • Spectrogram Software
    • Mapping Software
  • Data Analysis Guides (for those who start from raw data)

EOVSA Documentation


EOVSA System Software

EOVSA Observing Log

2016 November; December

2017 January; February; March; April; May; June; July; August; September; October; November; December

2018 January; February; March; April; May; June; July; August; September; October; November; December

2019 January; February; March; April; May; June; July; August; September; October; November; December

2020 January; February; March; April; May; June; July; August; September; October; November; December

2021 January; February; March; April; May; June; July; August; September; October; November; December

2022 SQL Outage

2023 January; February; March; April; May; June; July; August; September; October; November; December

2024 January; February; March; April;May; June; July; August; September; October; November

EOVSA Scientist on Duty

OVRO-LWA Solar-Dedicated Spectroscopic Imager

The OVRO-LWA (Owens Valley Radio Observatory Long Wavelength Array) has recently been upgraded to include a solar-dedicated beam and two solar imaging modes (slow visibilities of 352 antennas with a 10-s cadence, and fast visibilities of 48 antennas with a 0.1-s cadence). The large collecting area and excellent calibration provide unprecedented high-sensitivity imaging of the quiet Sun and bursts. The array is currently in commissioning and observations are not yet continuous, but they are becoming more so. See the daily realtime data at http://ovsa.njit.edu/status.php for real-time display of the spectrogram and a selection of images, both updated on a 1-min cadence.

Solar-Dedicated Modes

  • Beamformer: the beamformer uses the 256 core antennas to form a synthesized beam of more than 1 degree in size that tracks the Sun from sunrise to sunset. This permits a continuous record of the full-Stokes total flux (without spatial resolution) of the Sun (a dynamic spectrum) with 24 kHz frequency resolution (3072 frequencies from 15-90 MHz) and as low as 1 ms time resolution.
  • Slow Visibility Imaging: in this mode, the entire 352-element array is interferometrically correlated to provide visibilities for imaging at all 3072 frequencies at 10-s time resolution. This is ideal for imaging quiet Sun and slowly-varying emission such as coronal mass ejections and active region variability.
  • Fast Visibility Imaging: in this mode, a subset of 48 antennas (chosen to include mainly outer antennas to maintain good spatial resolution) is interferometrically correlated to provide visibilities for imaging at 768 frequencies (96 kHz frequency resolution) at 0.1-s time resolution. This is ideal for imaging rapidly varying emission such as type II and type III bursts as well as many other solar spectral fine structures.

Inital Data Access

In its current commissioning state, we try to run the beamformer and imaging pipeline every day in real-time since November 2023 (no latency for beamforming spectrograms and 5-10 min latency for images). Quicklook real-time spectrograms/images can be accessed from http://ovsa.njit.edu/status.php. To access data from previous days, use the following links (replace yyyymmdd with the date you desire):

Note our pipeline processing development is still in the early phase. For example, absolute flux calibrations have not been done for the beamformer spectrograms. Also, artificial effects (including ionospheric refraction effects) are present in the images that cause distortions/shifts. We caution interested users only to consider them for quick-look purposes at this point. Please contact the EOVSA PIs (Dale Gary, Bin Chen) if you intend to use them for science.

OVRO-LWA Operation Notes

OVRO-LWA Operation Notes

Tohbans

Trouble Shooting Guide

Tohban Records

Owen's Notes

Caius' Notes

Tohban EOVSA Imaging Tutorial A-Z

Tohban OVRO-LWA Imaging Tutorial

Tohban Guide to Self Calibration and Imaging for EOVSA

Guide to Upgrade SolarSoft(SSW)

EOVSA Publications

Here is a (partial) list of publications that utilize EOVSA data. See also the collection of EOVSA publications at this NASA/ADS Library.

2024
Collier, H., Hayes, L. A., Yu, S., Battaglia, A. F., Ashfield, W., Polito, V., Harra, L. K., & Krucker, S. (2024), arXiv e-prints, arXiv:2402.10546. “Localising pulsations in the hard X-ray and microwave emission of an X-class flare”
Saqri, J., Veronig, A. M., Battaglia, A. F., Dickson, E. C. M., Gary, D. E., & Krucker, S. (2024), Astronomy and Astrophysics, 683, A41. "Efficiency of solar microflares in accelerating electrons when rooted in a sunspot"
2023
Tan, B., Yan, Y., Huang, J., Zhang, Y., Tan, C., & Zhu, X. (2023), Advances in Space Research, 72, 5563. "The physics of solar spectral imaging observations in dm-cm wavelengths and the application on space weather"
Li, D., Li, Z., Shi, F., Su, Y., Chen, W., Yu, F., Li, C., Qiu, Y., Huang, Y., & Ning, Z. (2023), Astronomy and Astrophysics, 680, L15. "Observational signature of continuously operating drivers of decayless kink oscillation"
Wang, M., Chen, B., Yu, S., Gary, D. E., Lee, J., Wang, H., & Cohen, C. (2023), The Astrophysical Journal, 954, 32. "The Solar Origin of an In Situ Type III Radio Burst Event"
Gary, D. E. (2023), Annual Review of Astronomy and Astrophysics, 61, 427. "New Insights from Imaging Spectroscopy of Solar Radio Emission"
Nita, G. M., Fleishman, G. D., Kuznetsov, A. A., Anfinogentov, S. A., Stupishin, A. G., Kontar, E. P., Schonfeld, S. J., Klimchuk, J. A., & Gary, D. E. (2023), The Astrophysical Journal Supplement Series, 267, 6. "Data-constrained Solar Modeling with GX Simulator"
Song, D.-C., Tian, J., Li, Y., Ding, M. D., Su, Y., Yu, S., Hong, J., Qiu, Y., Rao, S., Liu, X., Li, Q., Chen, X., Li, C., & Fang, C. (2023), The Astrophysical Journal, 952, L6. "Spectral Observations and Modeling of a Solar White-light Flare Observed by CHASE"
Mondal, S., Chen, B., & Yu, S. (2023), The Astrophysical Journal, 949, 56. "Multifrequency Microwave Imaging of Weak Transients from the Quiet Solar Corona"
Kontar, E. P., Emslie, A. G., Motorina, G. G., & Dennis, B. R. (2023), The Astrophysical Journal, 947, L13. "The Efficiency of Electron Acceleration during the Impulsive Phase of a Solar Flare"
Saqri, J., Veronig, A. M., Dickson, E. C. M., Podladchikova, T., Warmuth, A., Xiao, H., Gary, D. E., Battaglia, A. F., & Krucker, S. (2023), Astronomy and Astrophysics, 672, A23. "Multi-point study of the energy release and impulsive CME dynamics in an eruptive C7 flare"
2022
Kou, Y., Cheng, X., Wang, Y., Yu, S., Chen, B., Kontar, E. P., & Ding, M. (2022), Nature Communications, 13, 7680. "Microwave imaging of quasi-periodic pulsations at flare current sheet"
Chertok, I. M. (2022), Monthly Notices of the Royal Astronomical Society, 517, 2709. "On some features of the solar proton event on 2021 October 28 - GLE73"
Lörinčík, J., Polito, V., De Pontieu, B., Yu, S., & Freij, N. (2022), Frontiers in Astronomy and Space Sciences, 9, 334. "Rapid variations of Si IV spectra in a flare observed by interface region imaging spectrograph at a sub-second cadence"
Klein, K.-L., Musset, S., Vilmer, N., Briand, C., Krucker, S., Francesco Battaglia, A., Dresing, N., Palmroos, C., & Gary, D. E. (2022), Astronomy and Astrophysics, 663, A173. "The relativistic solar particle event on 28 October 2021: Evidence of particle acceleration within and escape from the solar corona"
Fleishman, G. D., Nita, G. M., Chen, B., Yu, S., & Gary, D. E. (2022), Nature, 606, 674. "Solar flare accelerates nearly all electrons in a large coronal volume"
Li, X., Guo, F., Chen, B., Shen, C., & Glesener, L. (2022), The Astrophysical Journal, 932, 92. "Modeling Electron Acceleration and Transport in the Early Impulsive Phase of the 2017 September 10th Solar Flare"
Zhang, J., Chen, B., Yu, S., Tian, H., Wei, Y., Chen, H., Tan, G., Luo, Y., & Chen, X. (2022), The Astrophysical Journal, 932, 53. "Implications for Additional Plasma Heating Driving the Extreme-ultraviolet Late Phase of a Solar Flare with Microwave Imaging Spectroscopy"
Liu, N., Jing, J., Xu, Y., & Wang, H. (2022), The Astrophysical Journal, 930, 154. "Multi-instrument Comparative Study of Temperature, Number Density, and Emission Measure during the Precursor Phase of a Solar Flare"
López, F. M., Giménez de Castro, C. G., Mandrini, C. H., Simões, P. J. A., Cristiani, G. D., Gary, D. E., Francile, C., & Démoulin, P. (2022), Astronomy and Astrophysics, 657, A51. "A solar flare driven by thermal conduction observed in mid-infrared"
Unverferth, J., & Longcope, D. (2021), The Astrophysical Journal, 923, 248. "Examining Flux Tube Interactions as a Cause of Sub-alfvénic Outflow"
2021
Wei, Y., Chen, B., Yu, S., Wang, H., Jing, J., & Gary, D. E. (2021), The Astrophysical Journal, 923, 213. "Coronal Magnetic Field Measurements along a Partially Erupting Filament in a Solar Flare"
Jing, J., Inoue, S., Lee, J., Li, Q., Nita, G. M., Xu, Y., Liu, C., Gary, D. E., & Wang, H. (2021), The Astrophysical Journal, 922, 108. "Understanding the Initiation of the M2.4 Flare on 2017 July 14"
Battaglia, A. F., Saqri, J., Massa, P., Perracchione, E., Dickson, E. C. M., Xiao, H., Veronig, A. M., Warmuth, A., Battaglia, M., Hurford, G. J., Meuris, A., Limousin, O., Etesi, L., Maloney, S. A., Schwartz, R. A., Kuhar, M., Schuller, F., Senthamizh Pavai, V., Musset, S., Ryan, D. F., Kleint, L., Piana, M., Massone, A. M., Benvenuto, F., Sylwester, J., Litwicka, M., Stȩślicki, M., Mrozek, T., Vilmer, N., Fárník, F., Kašparová, J., Mann, G., Gallagher, P. T., Dennis, B. R., Csillaghy, A., Benz, A. O., & Krucker, S. (2021), Astronomy and Astrophysics, 656, A4. "STIX X-ray microflare observations during the Solar Orbiter commissioning phase"
Shaik, S. B., & Gary, D. E. (2021), The Astrophysical Journal, 919, 44. "Implications of Flat Optically Thick Microwave Spectra in Solar Flares for Source Size and Morphology"
Kocharov, L., Omodei, N., Mishev, A., Pesce-Rollins, M., Longo, F., Yu, S., Gary, D. E., Vainio, R., & Usoskin, I. (2021), The Astrophysical Journal, 915, 12. "Multiple Sources of Solar High-energy Protons"
Chen, B., Battaglia, M., Krucker, S., Reeves, K. K., & Glesener, L. (2021), The Astrophysical Journal, 908, L55. "Energetic Electron Distribution of the Coronal Acceleration Region: First Results from Joint Microwave and Hard X-Ray Imaging Spectroscopy"
Chhabra, S., Gary, D. E., Hallinan, G., Anderson, M. M., Chen, B., Greenhill, L. J., & Price, D. C. (2021), The Astrophysical Journal, 906, 132. "Imaging Spectroscopy of CME-associated Solar Radio Bursts using OVRO-LWA"
2020 and earlier
Reeves, K. K., Polito, V., Chen, B., Galan, G., Yu, S., Liu, W., & Li, G. (2020), The Astrophysical Journal, 905, 165. "Hot Plasma Flows and Oscillations in the Loop-top Region During the 2017 September 10 X8.2 Solar Flare"
Nindos, A. (2020), Frontiers in Astronomy and Space Sciences, 7, 57. "Incoherent Solar Radio Emission"
Yu, S., Chen, B., Reeves, K. K., Gary, D. E., Musset, S., Fleishman, G. D., Nita, G. M., & Glesener, L. (2020), The Astrophysical Journal, 900, 17. "Magnetic Reconnection during the Post-impulsive Phase of a Long-duration Solar Flare: Bidirectional Outflows as a Cause of Microwave and X-Ray Bursts"
Chen, B., Yu, S., Reeves, K. K., & Gary, D. E. (2020), The Astrophysical Journal, 895, L50. "Microwave Spectral Imaging of an Erupting Magnetic Flux Rope: Implications for the Standard Solar Flare Model in Three Dimensions"
Kuroda, N., Fleishman, G. D., Gary, D. E., Nita, G. M., Chen, B., & Yu, S. (2020), Frontiers in Astronomy and Space Sciences, 7, 22. "Evolution of Flare-accelerated Electrons Quantified by Spatially Resolved Analysis"
Glesener, L., Krucker, S., Duncan, J., Hannah, I. G., Grefenstette, B. W., Chen, B., Smith, D. M., White, S. M., & Hudson, H. (2020), The Astrophysical Journal, 891, L34. "Accelerated Electrons Observed Down to <7 keV in a NuSTAR Solar Microflare"
Karlický, M., Chen, B., Gary, D. E., Kašparová, J., & Rybák, J. (2020), The Astrophysical Journal, 889, 72. "Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare"
Fleishman, G. D., Gary, D. E., Chen, B., Kuroda, N., Yu, S., & Nita, G. M. (2020), Science, 367, 278. "Decay of the coronal magnetic field can release sufficient energy to power a solar flare"
Chen, B., Shen, C., Gary, D. E., Reeves, K. K., Fleishman, G. D., Yu, S., Guo, F., Krucker, S., Lin, J., Nita, G. M., & Kong, X. (2020), Nature Astronomy, 4, 1140. "Measurement of magnetic field and relativistic electrons along a solar flare current sheet"
Lee, J. (2018), Journal of Astronomy and Space Sciences, 35, 211. "Analysis of Solar Microwave Burst Spectrum, I. Nonuniform Magnetic Field"
Gary, D. E., Bastian, T. S., Chen, B., Fleishman, G. D., & Glesener, L. (2018), Science with a Next Generation Very Large Array, 517, 99. "Radio Observations of Solar Flares"
Polito, V., Dudík, J., Kašparová, J., Dzifčáková, E., Reeves, K. K., Testa, P., & Chen, B. (2018), The Astrophysical Journal, 864, 63. "Broad Non-Gaussian Fe XXIV Line Profiles in the Impulsive Phase of the 2017 September 10 X8.3-class Flare Observed by Hinode/EIS"
Gary, D. E., Chen, B., Dennis, B. R., Fleishman, G. D., Hurford, G. J., Krucker, S., McTiernan, J. M., Nita, G. M., Shih, A. Y., White, S. M., & Yu, S. (2018), The Astrophysical Journal, 863, 83. "Microwave and Hard X-Ray Observations of the 2017 September 10 Solar Limb Flare"
Fleishman, G. D., Nita, G. M., Kuroda, N., Jia, S., Tong, K., Wen, R. R., & Zhizhuo, Z. (2018), The Astrophysical Journal, 859, 17. "Revealing the Evolution of Non-thermal Electrons in Solar Flares Using 3D Modeling"
Kuroda, N., Gary, D. E., Wang, H., Fleishman, G. D., Nita, G. M., & Jing, J. (2018), The Astrophysical Journal, 852, 32. "Three-dimensional Forward-fit Modeling of the Hard X-Ray and Microwave Emissions of the 2015 June 22 M6.5 Flare"
Wang, H., Liu, C., Ahn, K., Xu, Y., Jing, J., Deng, N., Huang, N., Liu, R., Kusano, K., Fleishman, G. D., Gary, D. E., & Cao, W. (2017), Nature Astronomy, 1, 0085. "High-resolution observations of flare precursors in the low solar atmosphere"
Nita, G. M., Hickish, J., MacMahon, D., & Gary, D. E. (2016), Journal of Astronomical Instrumentation, 5, 1641009-7366. "EOVSA Implementation of a Spectral Kurtosis Correlator for Transient Detection and Classification"
Nita, G. M., & Gary, D. E. (2016), Journal of Geophysical Research (Space Physics), 121, 7353. "Measurement of duration and signal-to-noise ratio of astronomical transients using a Spectral Kurtosis spectrometer"
Wang, Z., Gary, D. E., Fleishman, G. D., & White, S. M. (2015), The Astrophysical Journal, 805, 93. "Coronal Magnetography of a Simulated Solar Active Region from Microwave Imaging Spectropolarimetry"
Gary, D. E., Fleishman, G. D., & Nita, G. M. (2013), Solar Physics, 288, 549. "Magnetography of Solar Flaring Loops with Microwave Imaging Spectropolarimetry"

VLA Flare List and Publications

See this link for a list of flare observations made by the Karl G. Jansky Very Large Array (VLA). Below is a partial list of publications that utilize VLA solar data (see also this NASA/ADS Library).


Radio Data from Around The Heliosphere

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