EOVSA Data Products

Welcome to the EOVSA data products documentation. EOVSA observes the full disk of the Sun at all times when the Sun is >10 degrees above the local horizon, which is season dependent and ranges from 7-12 hours duration centered on 20 UT. During January, coverage will be 16-24 UT daily, 7 days/week. EOVSA will provide microwave spectra and imaging at up to 451 frequencies between 1 and 18 GHz. We deliver the radio interferometry data in level 0-2.

Data Definition

Level 1 - Calibrated visibility data

Level 1 data have all of the required content to produce Level 2 data products.

Level 2 - Images and spectrogram data in standard FITS format

Getting level 2 data

EOVSA Level 2 data products can be retrieved from the "synoptic data" page:

http://www.ovsa.njit.edu/fits/synoptic

Example - get the synoptic data on December 25, 2019

• go to EOVSA browser page.
• Browse to December 25, 2019.
• Click "synoptic fits" button next to the calendar tool.
• Select the data product you want to download based on the name in the following list.

List of Level 2 data products

category	data product	name
Dynamic Spectrum	All-day TP spectrum	EOVSA_TPall_yyyymmdd.fts
	All-day XP spectrum	EOVSA_XPall_yyyymmdd.fts
Image
	Synoptic 1.4 GHz image	eovsa_20191225.spw00-01.tb.disk.fits
	Synoptic 3.0 GHz image	eovsa_20191225.spw02-05.tb.disk.fits
	Synoptic 4.5 GHz image	eovsa_20191225.spw06-10.tb.disk.fits
	Synoptic 6.8 GHz image	eovsa_20191225.spw11-20.tb.disk.fits
	Synoptic 10.2 GHz image	eovsa_20191225.spw21-30.tb.disk.fits
	Synoptic 13.9 GHz image	eovsa_20191225.spw31-43.tb.disk.fits

Reading level 2 data

Software

[suncasa https://github.com/suncasa/suncasa]

All-day TP spectrum

Daily total power full-Sun-integrated spectrogram calibrated in solar flux units are provided at 451 frequencies and 1 s time resolution.

from suncasa.eovsa import eovsa_dspec as ds
## define the dynamic spectrum file.
tpfits = 'EOVSA_TPall_20191225.fts'
## display the dynamic spectrum. 
ds.dspec(tpfits)

All-day XP spectrum

Daily cross power spectrogram (mean flux from baselines with "intermediate" lengths) calibrated in solar flux units are provided at 451 frequencies and 1 s time resolution. XP spectrogram has much better sensitivity to weak bursts.

from suncasa.eovsa import eovsa_dspec as ds
## define the dynamic spectrum file.
tpfits = 'EOVSA_XPall_20191225.fts'
## display the dynamic spectrum. 
ds.dspec(tpfits)

Synoptic 6-band Images

Full disk images at 6 selected frequency bands centered at 1.4, 3.0, 4.5, 6.8, 10.2, and 13.9 GHz are provided once per day, calibrated in brightness temperature.