1. Geomagnetic Coordinates 1940-2005

The GMCORD program provides a determination of the geomagnetic coordinates for any selected global location. The program uses a polynomial fit (see POLYFIT program below) of the dipole Gauss coefficients from the geomagnetic reference field models (see file ALL-IGRF.TAB below). The fitting allows specification of any date from the first day of January 1940 to the projected values on the last day of December 2005. In addition to the computation of the dipole coordinates, the geomagnetic pole locations, the dipole moment, and station dipole field values are displayed on your screen. This program uses a computational method devised by Fraser-Smith (1987) and coded by W.H. Campbell. An example screen is shown below.

To run the program, place the disk in the computer, select the drive letter that is being used for the disk, and enter GMCORD. Enter a name for your selected station location, enter its latitude and longitude in geographic coordinates (decimal degrees with + for North and East, - for South and West), and answer the date questions (months are to be given as numbers 1 to 12). The displayed output may be saved by using the "print screen" key on your computer.

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