Daily Global Ionosphere Maps GIM-foF2 of the F2 layer critical frequency 
produced with IRI-PLas model ingesting JPL GPS TEC IONEX MAP      
foF2 values in 0.1 MHz.
0, 1, ... , 23 Hours, UT.    
Geographic coordinates:                       
   87.5 -87.5  2.5    LAT1/ LAT2/ DLAT	     
 -180.0 180.0  5.0    LON1/ LON2/ DLON