UL230
[ Name  Synopsis  Arguments  Description  Diagnostics  Common Blocks  Dependencies  See Also  Reported Bugs  Examples ]
Name

Subroutine UL230  evaluate the integral invariant coordinate I
Synopsis
REAL*8 finv INTEGER*4 ifail CALL UL230 (finv, ifail)
Arguments

finv
 Integral invariant coordinate [out]

ifail
 Error flag (see diagnostics) [out]
Description

The subroutine UL230 evaluates the integral invariant coordinate I
for the current magnetic field line segment stored in the common block
UC170. The integration algorithm takes advantage
from the fact that the magnetic field line segment has been traced by the
fourthorder RungeKutta method. The integral invariant coordinate
I is mainly used to determine McIlwain's shell parameter L.
References
 Heynderickx, D., and Lemaire, J., Improvements to trapped radiation software, TREND, Technical Note 1 (1993)
Diagnostics

23001, field line segment corrupted
23002, different B at the field line segment extremities
23003, invalid B along the field line segment
Common Blocks
Dependencies
Called by

UL220,
get information on a magnetic field line segment
UF411, search a local magnetic equator
UF415, rebuild the labels of the field line
Calls

None
See also

UL240,
evaluate the Hilton's function
UF420, trace a magnetic field line segment passing through a given position
Reported Bugs

None
Examples

None