Accession Number:

ADA156851

Title:

Alternative Coordinate Systems for High Latitude Ionospheric Plasma Studies.

Descriptive Note:

Technical rept. May 82-Mar 83,

Corporate Author:

MISSION RESEARCH CORP SANTA BARBARA CA

Personal Author(s):

Report Date:

1983-03-15

Pagination or Media Count:

61.0

Abstract:

Detailed numerical calculations which attempt to model the electromagnetic coupling between the polar ionosphere and the solar wind driven magnetospheric current systems must be formulated with a recognition of the wide range of physical scale sizes which must be accommodated within the constraint of finite computer resources. This is especially true of a numerical calculation which attempts to include the effects of high altitude nuclear explosion generated disturbances in the polar ionosphere. For this problem it is necessary to resolve simultaneously both small scale features approx 100 km or less in extent in the ionosphere and large scale features of the magnetosphere features with dimensions greater than the radius of the earth. If standard coordinate systems are used, a computational grid which spans the magnetosphere will contain an unacceptably large number of cells. This report describes a unique coordinate system, the zeta coordinate system, which was developed to circumvent this problem. The zeta coordinate system has the property of being approximately aligned with a dipole magnetic field in the near-earth zone, but it transitions smoothly to approach a cylindrical coordinate system far from the earth. This coordinate system is specified by simple analytic expressions.

Subject Categories:

  • Atmospheric Physics
  • Nuclear Weapons

Distribution Statement:

APPROVED FOR PUBLIC RELEASE