European Space Agency

Royal Belgian Institute for Aeronomy

um531 - evaluate the geomagnetic field

subroutine  um531(rkm, st, ct, sph, cph, br, bt, bp, ifail)

geomagnetic field

Parameters:

• rkm [real8,in] :: geodetic radius in Earth radii

• st [real8,in] :: sine of the geodetic colatitude

• ct [real8,in] :: cosine of the geodetic colatitude

• sph [real8,in] :: sine of the longitude

• cph [real8,in] :: cosine of the longitude

• br [real8,out] :: geomagnetic field component along ‘rho’

• bt [real8,out] :: geomagnetic field component along ‘theta’

• bp [real8,out] :: geomagnetic field component along ‘phi’

• ifail [integer4,out] :: error flag (see Diagnostics)

Description

The subroutine um531() evaluates the geomagnetic field vector from the Schmidt-normalized coefficients stored in argument mint of common block uc140.

History

In version 2.03 and earlier, the error diagnostic -53101 is generated for both error diagnostics -53101 and -53102.

Diagnostics

• -53101, order of the expansion exceeds 14

• -53102, too small value of the sine of the geodetic colatitude

Common Blocks

• uc140 - magnetic field

Dependencies

Called by

• um530 - evaluate the magnetic field vector

Calls

None

See also

• um515 - perform a Schmidt normalisation

• um537 - Kluge evaluation of the geomagnetic field

Reported Bugs

None

Examples

None

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UNILIB/tags/v3.03