Difference between revisions of "EOVSA Data products"

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(Level 0 - Raw visibility data from the instrument)
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[[File:pipeline_flowchart.jpg|center|600px]]
 
[[File:pipeline_flowchart.jpg|center|600px]]
  
=Data Definition=
+
 
 
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.
 
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==
+
=Level 0 - Raw visibility data from the instrument=
 
TBD
 
TBD
  
==Level 1 - Calibrated visibility data==
+
=Level 1 - Calibrated visibility data=
 
Level 1 data have all of the required content to produce Level 2 data products.
 
Level 1 data have all of the required content to produce Level 2 data products.
===CASA 1-min averaged ms===
+
==CASA 1-min averaged ms==
 
EOVSA 1-min averaged visibility data in CASA ms format can be retrieved from the following page:
 
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
 
http://www.ovsa.njit.edu/fits/UDBms_slfcaled
  
===CASA Event ms===
+
==CASA Event ms==
 
TBD
 
TBD
  
==Level 2 - Images and spectrogram data in standard FITS format ==
+
=Level 2 - Images and spectrogram data in standard FITS format =
  
===Getting level 2 data===  
+
==Getting level 2 data==  
  
 
EOVSA Level 2 data products can be retrieved from the "synoptic data" page:
 
EOVSA Level 2 data products can be retrieved from the "synoptic data" page:
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|}
 
|}
  
===Reading level 2 data===
+
==Reading level 2 data==
====Software====
+
===Software===
 
[https://github.com/suncasa/suncasa suncasa]
 
[https://github.com/suncasa/suncasa suncasa]
  
====All-day TP spectrum====
+
===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.
 
Daily total power full-Sun-integrated spectrogram calibrated in solar flux units are provided at 451 frequencies and 1 s time resolution.
  
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[[File:TPSP.jpeg|center|500px]]
 
[[File:TPSP.jpeg|center|500px]]
  
====All-day XP spectrum====
+
===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.
 
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.
  
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[[File:XPSP.jpeg|500px| center]]
 
[[File:XPSP.jpeg|500px| center]]
  
====Synoptic 6-band Images====
+
===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. [[File:synoptic_image.jpg| center |400px]]
 
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. [[File:synoptic_image.jpg| center |400px]]
  
====10-min 6-band Images====
+
===10-min 6-band Images===
====Event images====
+
===Event images===

Revision as of 21:23, 23 March 2020

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


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