Manipulating EIT data


This chapter is meant to be used as a brief guide to manipulating and displaying EIT data. It is assumed that you have identified the data sets you want to use, and have installed the SolarSoftware tree with up-to-date EIT software and that the software tree is functioning properly.

The EIT data should be level zero FITS files. Usually level zero FITS data files are named something like "efz19970804.080011". If you have quicklook data, with names like "efr19970804.080011", you should obtain level zero data from an EIT Co-I (level zero data is generally available a month after the observation).

Getting Started: the eit_display widget

A quick way to display EIT data is using the EIT_display widget. At the IDL prompt, enter:

IDL> eit_display

and you should see something like this:

DIGITAL UNIX environment
Windows 2000 environment


As show on these screen captures, the actual display differs slightly depending on your system and/or your setup. This simple graphical user's interface is able to display any EIT image or movie. In order to run properly, eit_display needs the environment variable REF_DIR to be set to the directory containing EIT data. If the EIT data is not in REF_DIR, you can also enter it in the directory window.

Eit_display automatically applies the best up to date calibration to the images before displaying them. You cannot see raw data with eit_display.


Web curator: Frédéric Auchère
Responsible NASA official: Joseph B. Gurman, Facility Scientist, Solar Data Analysis Center
+1 301 286-4767
NASA Goddard Space Flight Center
Solar Physics Branch / Code 682

Last revised: Friday, August 16, 2002 2:57 PM - F. Auchère