Directory Title:        Models Distribution and Staging Directory
Last Updated:           18-JUN-1997
Principal Contact:      Natasha Papitashvili, natasha@nssdca.gsfc.nasa.gov
                                Telephone: (301) 286-3451
                                FAX: (301) 286-1771
Organization:           National Space Science Data Center, Code 633
                        NASA/Goddard Space Flight Center, Greenbelt, MD 20771
Computer System:        NSSDC Computing Facility

Brief Description:      The purpose of this directory is to allow users access 
to NSSDC's holding of geomagnetic field models. Currently posted models 
and their subdirectories are:
  

Name of model          Brief description                       Name of dir.

IGRF------ Int. Geomagnetic Ref. Field 1945-1995 -------------- /igrf
GSFC ----- GSFC 65,66,80,83, and 87 geomagnetic field model ------- /gsfc
Jens_Cain- Jensen & Cain 1962 magnetic field model ------------ /jensen_cain
MGST ----- Magsat (6/80) and (4/81) geom. field models -------- /mgst

The subdirectories contain all source code, coefficients, and text files 
necessary to successfully use these models. 
The model descriptions are at 
http://nssdc.gsfc.nasa.gov/space/model/magnetos/magnetic_index.html.

NEW(11/29/95): IGRF95 coefficient set corrected.
NEW(08/08/95): IGRF model updated to year 2000.
NEW(03/22/02): GSFC 65,66 models were added.