EOVSA Data products

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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.

Pipeline flowchart.jpg

Brief description of the data products:

Our working definition is that Level 0 is the raw visibility data from the instrument, whereas Level 1 corresponds to the calibrated visibility data, which have all of the required content to produce Level 2 images and spectrogram data in standard FITS format. All of these data products are archived and available online, accessed from the EOVSA server.

Level 0 - Raw visibility data from the instrument

TBD

Level 1 - Calibrated visibility data

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

CASA 1-min averaged ms

EOVSA 1-min averaged visibility data in CASA ms format can be retrieved from the following page:

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

CASA Event ms

TBD

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

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)
TPSP.jpeg

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)
XPSP.jpeg

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.
Synoptic image.jpg

10-min 6-band Images

Event images