Dgary: Created page with "Data are [http://ovsa.njit.edu/imaging_workshop/ here]. Folder ''Flare_20170910'' contains two measurement sets at full 1-s time resolution: # IDB20170910154625.corrected.ms (..."

2017-12-17T14:42:09Z

Created page with "Data are [http://ovsa.njit.edu/imaging_workshop/ here]. Folder ''Flare_20170910'' contains two measurement sets at full 1-s time resolution: # IDB20170910154625.corrected.ms (..."

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Data are [http://ovsa.njit.edu/imaging_workshop/ here]. Folder ''Flare_20170910'' contains two measurement sets at full 1-s time resolution:
# IDB20170910154625.corrected.ms (300 MB) containing the first 10 minutes of the flare, calibrated but no self-calibration
# IDB20170910155625.corrected.ms (377 MB) containing the second 10 minutes of the flare
Bin has other datasets that are self-calibrated, but unfortunately they are on a machine that is not reachable at the moment. We will upload the data when available, hopefully Monday.

Folder ''AR_20170710'' contains 8 measurements sets at 60-s time resolution.
# The seven UDB20170710*.corrected.ms are files for each scan separately, ranging in size from 7 - 150 MB depending on the length of the scan.
# UDB20170710_allday.ms (595 MB) is the same data concatenated into a single file. However, each scan has a separate source ID.
The AR data are also calibrated but not self-calibrated. In fact, we need to create a strategy for self-calibration of such data. You can get an overview of the AR coverage on that day by looking at the plot at http://ovsa.njit.edu/flaremon/daily/2017/XSP20170710.png. The separate scan files above are labeled with the time of the start of the scan, and each scan covers the time of continuous solar data between each calibration scan.

Here are some things to consider when working with the data:
* Antennas 1-8 and 12 have a wide sky coverage, while antennas 9-11 and 13 are the older equatorial mounts that can only cover +/- 55 degrees from the meridian. All antennas were tracking for the flare, but for portions of the all-day scan (roughly before 1600 UT or after 2400 UT) only 9 antennas will be tracking. Data for non-tracking antennas is NOT flagged, so if you try to image these periods, you'll need to manually omit ants 9-11 and 13.
* Because of the 2.5 GHz high-pass filters, data are taken only for bands 4-34. These will be labeled spectral window (spw) 0-31 in the measurement sets. However, band 4 (spw 0) is currently not calibrated, so only the 30 spectral windows 1-31 (bands 5-34, or frequencies 3-18 GHz) are valid data. You'll need to omit spw 0 when making images.
* In principle, circular polarization should be valid and meaningful, but no polarization calibration has been done (yet) so no non-ideal behavior (leakage terms, etc.) have been accounted for.

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Dgary: Created page with "Data are [http://ovsa.njit.edu/imaging_workshop/ here]. Folder ''Flare_20170910'' contains two measurement sets at full 1-s time resolution: # IDB20170910154625.corrected.ms (..."