European Space Agency

Royal Belgian Institute for Aeronomy

um513 - set the DGRF/IGRF model coefficients

subroutine  um513(tm, lbl)

Parameters:

• tm [real8,in] :: Epoch of the geomagnetic field calculation expressed in year

• lbl [character32,out] :: label of the geomagnetic field model

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 1900 and 2015. The expansion coefficients are extrapolated from the nearest 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

Dependencies

Called by

• um510 - select an internal 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

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UNILIB/tags/v3.02