Accession Number : ADA321634

Title :   Improved Models of the Inner and Outer Radiation Belts.

Descriptive Note : Final rept. Jun 90-Jul 95,

Corporate Author : MCDONNELL DOUGLAS AEROSPACE HUNTINGTON BEACH CA SPACE SYSTEMS

Personal Author(s) : Pfitzer, K. A.

PDF Url : ADA321634

Report Date : DEC 1995

Pagination or Media Count : 187

Abstract : A pitch angle dependent invariant routine has been developed. This routine written in FORTRAN calculates the first and second invariant for an arbitrary number of pitch angles at any satellite location within the magnetosphere. The routine uses a new fast version of the IGRF internal magnetic field and the Olson-Pfitzer 1977 external magnetic field routine. The internal routine uses term dropping at large distances as well as improved coding to obtain speed advantages of 1.5 to 35 over the standard internal. A vector potential model of the Chapman-Ferraro currents was developed for the March 1991 event which was observed by the CRRES satellite. This model was used to study the induction electric field and the electric field's importance on particle acceleration during the March 1991 injection event. An analysis using this induction electric field, which was calculated to be as large as .4 V/m, showed that it is capable of large increases in particle energy, but the induction electric field alone is not sufficient to explain the newly created inner belt. Greatly reduced cosmic ray cutoffs during the solar proton event which was in progress during the event, along with the induction electric field appear to be more probable source of the new belts

Descriptors :   *IONOSPHERIC MODELS, *RADIATION BELTS, ANGLES, PITCH(INCLINATION), ELECTRIC FIELDS, FORTRAN, VECTOR ANALYSIS, MAGNETOSPHERE, SOLAR COSMIC RAYS.

Subject Categories : Geomagnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE