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Trapped Radiation ENvironment model Development

UM513

[ Name | Synopsis | Arguments | Description | Diagnostics | Common Blocks | Dependencies | See Also | Reported Bugs | Examples ]

Name

    Subroutine UM513 - set the DGRF/IGRF model coefficients

Synopsis

      REAL*8        tm
      CHARACTER*32  lbl
      
      CALL UM513 (tm, lbl)

Arguments

    tm
    Epoch of the geomagnetic field calculation expressed in year [in]
    lbl
    Label of the geomagnetic field model [out]

Description

    The subroutine UM513 initializes the expansion coefficients of the geomagnetic field inside the common block UC140 with the coefficients of the DGRF/IGRF model. The tm arguments specifies the epoch to which the model has to be extrapolated. The base epochs of the model are the year multiple of 5 between 1945 and 1995. The expansion coefficients are extrapolated from the nearst base epoch that precedes the tm time. As result, the lbl argument contains a string with the name of the model.

History

    In version 1.11 and earlier, the description of the IGRF/DGRF 45-95 geomagnetic field models were included in a specific block data (DGRFBD). Since some Fortran compilers (e.g. Microsoft PowerStation) are not able to link correctly such block data, the DATA statements have been included in the subroutine UM533. Note that the common block DGRF is not more present in the UNILIB library.

Diagnostics

    None

Common Blocks

    UC140, magnetic field description

Dependencies

Called by

    UM510, select a geomagnetic field model

Calls

    UM515, perform a Schmidt normalisation

See also

    UM511, set the Jensen & Cain 1960 model coefficients
    UM512, set the GSFC 12/66 model coefficients

Reported Bugs

    None

Examples

    None