Accession Number:

ADA210337

Title:

The Space Radiation Environment at 840 KM

Descriptive Note:

Corporate Author:

AIR FORCE SYSTEMS COMMAND HANSCOM AFB MA GEOPHYSICS LAB

Report Date:

1989-06-27

Pagination or Media Count:

16.0

Abstract:

The Defense Meteorological Satellite Program DMSP F7 satellite, launched in November 1983, carries a dosimeter provided by the Air Force Geophysics Laboratory. The dosimeter uses planar silicon detectors behind four thicknesses of aluminum shielding to measure both radiation dose and high energy particle fluxes in the space radiation environment at 840 km. Energy thresholds in the detectors are set to distinguish low electron, high proton, and very high 40 MeV energy particle depositions. The dosimeter returns accurate, high-time-resolution doses measurements. Maps of the radiation dose electron and proton at 840 km are presented and compared to the NASA models. Maps of the very high energy deposits which can produce Single Event Upsets SEUs in the microelectronic components are also presented. Characteristics of energetic particles that enter the polar cap regions during solar particle events are discussed and compared to inner belt proton and cosmic ray background levels. Included is an analysis of two of the largest solar proton events since launch of the satellite, those of 16 February, 1984, and 26 April, l984. Keywords Radiation belts Dose Solar proton events Single event upsets Outer zone electrons Reprints.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE