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