UF425
[ Name  Synopsis  Arguments  Description  Diagnostics  Common Blocks  Dependencies  See Also  Reported Bugs  Examples ]
Name

Subroutine UF425  evaluate the curvature of the field lines
Synopsis
RECORD /zgeo/ mgp1, mgp2 RECORD /zvec/ mvb1, mvb2, mxnr1, mxnr2 REAL*8 ds CALL UF425 (mgp1, mvb1, mgp2, mvb2, ds, mxnr1, mxnr2)
Arguments

mgp1
 Geographic location of the starting point of the field line segment [in]

mvb1
 Magnetic field vector at the starting point [in]

mgp2
 Geographic location of the last point of the field line segment [in]

mvb2
 Magnetic field vector at the last point [in]

ds
 Arc length of the segment [in]

mxnr1
 Curvature vector related to the starting point [out]

mxnr2
 Curvature vector related to the last point [out]
Description

The subroutine UF425 evaluates the curvature vectors of a magnetic field
line on a segment defined by the arguments
mgp1
,
mvb1
, mgp2
, mvb2
, ds
.
Each curvature vector is parallel to the normal vector of the magnetic field line and is inversely proportional to the radius of curvature.
As result, the subroutine provides the curvature vectors at the starting and ending points of the segment.
Diagnostics

None
Common Blocks

UC160,
general constants
Dependencies
Called by

UF423,
Runge Kutta step
UF424, search the lowest B value
UT998, evaluate the magnetic field vector and the normal to the field line
Calls

UM530,
evaluate the magnetic field vector
See also

None
Reported Bugs

None
Examples

None