Accession Number : AD0751284

Title :   Secular Magnetic Variation and the Inner Zone.

Descriptive Note : Rept. for Oct 71-May 72,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Hilton,Henry H.

Report Date : 12 OCT 1972

Pagination or Media Count : 17

Abstract : The secular variation of the earth's magnetic field has important consequences concerning the steady-state inner zone of energetic protons. One consequence is the decrease in minimum altitude for particles having a constant flux invariant Phi and a constant invariant parameter Kappa. This affects the rate at which particles lose energy to free and bound atmospheric electrons. Another consequence is the increase in the magnitude of the mirror-point field, resulting in a slow increase in a particle's energy. It is found that for equatorially mirroring particles at a nominal L = 1.10, conservation of Kappa and Phi causes the minimum mirror altitude to decrease at a rate of 6 km/year using the IGRF (1965.0) model for the earth's magnetic field, and at a rate of 11 km/year using the POGO (8/69) model. (Author)

Descriptors :   (*VAN ALLEN RADIATION BELT, PROTONS), MAGNETOSPHERE, GEOMAGNETISM

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE