Accession Number : ADA130079

Title :   Stormer Equation Implementation, Using Offset Dipole Coordinates Derived from Specified Geographic Coordinates.

Descriptive Note : Technical rpet.,

Corporate Author : UTAH UNIV SALT LAKE CITY

Personal Author(s) : Cooke,David J

PDF Url : ADA130079

Report Date : Mar 1983

Pagination or Media Count : 15

Abstract : For many purposes it is useful to have a fast means of estimating directional cosmic ray cutoffs pertaining to any specified direction and location. The Stormer equation offers a means of determining directional cutoffs to a precision suitable for use in non-critical applications, at a speed many orders of magnitude faster than the process of determining precise cutoffs by the real geomagnetic field trajectory tracing method. Use of offset dipole coordinates in the Stormer equation allows minimization of errors in the cutoff estimates arising from the non-inclusion of other than dipolar field terms. A self contained procedure has been developed for computer use which, for any given location and direction expressed in geographic coordinates, first allows determination of the location and direction relative to the earth's equivalent magnetic dipole (whose location is determined from the lowest order harmonic field terms). The Stormer equation is then invoked, using these offset dipole coordinates, and a cutoff estimate so produced. This report contains a printed copy of a FORTRAN computer program developed to carry out this task. (Author)

Descriptors :   *COSMIC RAYS, COORDINATES, DIPOLES, CONVERSION, COMPUTER PROGRAMS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE