NAME: GEO2MAG() PURPOSE: Convert from geographic to geomagnetic coordinates EXPLANATION: Converts from GEOGRAPHIC (latitude,longitude) to GEOMAGNETIC (latitude, longitude). (Altitude remains the same) Latitudes and longitudes are expressed in degrees. CALLING SEQUENCE: mcoord=geo2mag(gcoord) INPUT: gcoord = a 2-element array of geographic [latitude,longitude], or an array [2,n] of n such coordinates. KEYWORD INPUTS: None OUTPUT: a 2-element array of magnetic [latitude,longitude], or an array [2,n] of n such coordinates COMMON BLOCKS: None EXAMPLES: geographic coordinates of magnetic south pole IDL> mcoord=geo2mag([79.3,288.59]) IDL> print,mcoord 89.999992 -173.02325 MODIFICATION HISTORY: Written by Pascal Saint-Hilaire (Saint-Hilaire@astro.phys.ethz.ch), May 2002