Accession Number : AD0774043

Title :   Solar Cycle Variations of Geomagnetically Trapped Radiation.

Descriptive Note : Final rept. 20 Nov 68-30 Jun 73,

Corporate Author : FRANKLIN PIERCE COLL RINDGE N H DEPT OF RESEARCH

Personal Author(s) : Holeman,Ernest C.

Report Date : 31 JUL 1973

Pagination or Media Count : 248

Abstract : Observations of energetic geomagnetically trapped protons at low altitudes were made during the period December 1968 through May 1973 in order to study the solar cycle variations of geomagnetically trapped proton radiation for the eleven year solar cycle dating from November 1961. These observations consist of a series of flux measurements of 55 Mev protons made on nuclear emulsion radiation detectors flown on recoverable Air Force satellites, flux measurements of 115 Mev protons made on a sample selected from these, and preliminary flux measurements of six to 35 Mev protons from the AFCRL particle identifier on Air Force satellite S72-1. These observations form the basis for a series of trapped proton radiation models with variable parameters which are capable of predicting angular distributions, differential fluxes, integral fluxes, and omnidirectional fluxes as a function of spacial geometry and time. (Author)

Descriptors :   *Van Allen radiation belt, *Protons, Solar cycle, Solar cosmic rays, Particle flux, Periodic variations, Computer programs, Scientific satellites

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE