Flare Imaging

Preparation

First, identify the time when the flare in question happened. There are many ways to do this, but a nice way is to use the RHESSI Browser and check "EOVSA Radio Data" on the upper left. Use the time you identified to find the corresponding IDB file(s) under /data1/eovsa/fits/IDB/yyyymmdd/. Then, on pipeline, go to your working directory and copy the IDB data into your directory. Note, never, NEVER, work directly on the IDB data in the original data directory!. Here I use /data1/eovsa/fits/IDB/20170711/IDB20170711201620 (2017 July 11 C flare) as an example.

Calibration

Start CASA in your working directory (it takes a minute or so to load)

casa

1. Perform polarization rotation and attenuation calibration.

idbfile='IDB20170711201620'
from eovsapy import pipeline_cal as pc
pc.udb_corr(idbfile,calibrate=True)

This will create a new IDB dataset named IDB20170711201620_1

2. Import Miriad file into CASA.

importeovsa(idbfiles='IDB20170711201620_1', doscaling=False)

Remember it is important to set doscaling=False to disable scaling cross-correlation visibilities to auto-correlation. The output is automatically named "IDB20170711201620_1.ms"

3. Perform reference phase calibration and multiband delay calibration (daily phase calibration). First, go to [this page] and check if reference calibrations and daily phase calibrations have already been in the database.

calibeovsa('IDB20170711201620_1.ms'