GEO2MAG()

       Convert from geographic to geomagnetic coordinates

       Converts from GEOGRAPHIC (latitude,longitude) to GEOMAGNETIC (latitude,
       longitude).   (Altitude remains the same)
       Latitudes and longitudes are expressed in degrees.

       mcoord=geo2mag(gcoord)

       gcoord = a 2-element array of geographic [latitude,longitude], or an
                array [2,n] of n such coordinates.

       None

       a 2-element array of magnetic [latitude,longitude], or an array [2,n]
         of n such coordinates

       None

       geographic coordinates of magnetic south pole
       IDL> mcoord=geo2mag([79.3,288.59])
       IDL> print,mcoord
       89.999992      -173.02325

       Written by Pascal Saint-Hilaire (Saint-Hilaire@astro.phys.ethz.ch),
            May 2002

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