European Space Agency

European Space Agency

Royal Belgian Institute for Aeronomy

Royal Belgian Institute for Aeronomy

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ud315 - search the mirror point with the lowest altitude

subroutine  ud315(mpn, mps, ifail)
Parameters:

  • mpn [zgeo,out] :: Geographic position of the northern mirror point

  • mps [zgeo,out] :: Geographic position of the southern mirror point

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

Description

The subroutine ud315() scans the field line segments of a drift shell and determines the geographic positions of the mirror points with the lowest altitude in the northern and southern hemisphere. The drift shell has to be defined as a set of field line segments stored in the common blocks uc110, uc120, and uc130. One should note that the geographic locations returned in the arguments mpn and mps do not belong generally to the same magnetic field line segment. The subroutine ud315() updates also the argument klmp of the common block uc110.

History

  • From version 1.06, the location of both mirror points are refined by the use of a parabolic interpolation (calls to subroutine ud327()).

  • In version 2.01, errors have been fixed in subroutine ud327(). These errors affected the accuracy of subroutine ud315().

Diagnostics

  • -31501, problem with the variable k1st of the common block UC110

  • -31502, problem with the variable nbrfl of the common block UC120

Common Blocks

Dependencies

Called by

None

Calls

See also

Reported Bugs

None

Examples

None

UNILIB/tags/v3.02