EOVSA Data products

From EOVSA Wiki
Jump to navigation Jump to search

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

Data Definition

Level 0 - Raw visibility data from the instrument

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

CASA Event ms

Level 2 - Images and spectrogram data in standard FITS format

Data series

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

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 table.
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