Software for Interactive Ionogram Tracing and Inversion Program

This directory contains the software files related to an interactive
widget-based program to trace and invert ISIS ionograms (in CDF format).

This program requires IDL and an X terminal (X-windows, MACX, Sun).

After transferring the program files (using ftp) from this directory a user
needs to compile the Fortran file jackson4_idl.f
        f77 -o jackson4_idl jackson4_idl.f    (or f90, f95)
        f77 -o worldmap worldmap.f
and then run the widget program in IDL
        IDL>@comp
        IDL>isisgui
        
For information on how to proceed with the tracing and inversion the user
should double-click the HELP button (the text can also be viewed and printed
from this directory: file ISIS_HELP.HLP).

ISIS ionogram data can be obtained in binary from from https://nssdcftp.gsfc.nasa.gov 
and in CDF format from http://cdaweb.gsfc.nasa.gov. They should then be loaded 
into the directory where the tracing program resides (or into a subdirectory of 
this directory).

A search page at http://spdf.gsfc.nasa.gov/isis/isis_menu4.html lets users locate data for 
specified dates, times and other search criteria (currently only for ISIS-2 data).

The homepage for the ISIS sounder data restoration project is at
http://spdf.gsfc.nasa.gov/isis/isis-status.html.

Please acknowledge the NASA Space Physics Data Facility and the instrument's Principal
Investigator for data usage.

Keywords: ionosphere, topside, sounder, ionogram

Data contact: Dieter.Bilitza-1@nasa.gov>
NASA Official: Dr. Robert McGuire <robert.e.mcguire@nasa.gov>