AIRES library reference: geomagnetic.

c
c     Routine directly callable from C/C++ (it could be necessary to
c     append an underscore, "_", to its name depending on the C/C++
c     compiler used).
c
c
      subroutine geomagnetic(latitude, longitude, altitude, fdate,
     +                       bfield, inclination, declination)
c
c     Calculation of the geomagnetic field of a given location
c     using the IGRF model.
c
c     Written by: S. J. Sciutto, La Plata 1997, 2000, 2005, 2010, 2018.
c
c
c     Arguments:
c     =========
c
c     latitude........ (input, double precision) Geographical latitude
c                      (deg). Must be in the proper range.
c     longitude....... (input, double precision) Geographical
c                      longitude (deg). Must be in the proper range.
c     altitude........ (input, double precision) Site altitude in
c                      meters above sea level.
c     fdate........... (input, double precision) Date, encoded as a
c                      single real number. If date is positive, then
c                      it is interpreted as a floating point year
c                      (months and days are fractions of years). If
c                      negative, then abs(date) = day + 32 * month +
c                      512 * year.
c     bfield.......... (output, double precision) Magnetic field
c                      intensity (nT).
c     inclination..... (output, double precision) Inclination of the
c                      magnetic field with respect to the local
c                      horizontal plane (deg).
c     declination..... (output, double precision) Angle between the
c                      local meridian and the horizontal component of
c                      the magnetic field.
c
c
c<--->

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