Accession Number:

AD0261088

Title:

THE DISTRIBUTION OF TRAPPED PARTICLES IN A CHANGING MAGNETIC FIELD

Descriptive Note:

Corporate Author:

CHICAGO UNIV ILL ENRICO FERMI INST FOR NUCLEAR STUDIES

Personal Author(s):

Report Date:

1961-02-01

Pagination or Media Count:

1.0

Abstract:

T redistribution of charged p rticles in the mirror field Bs,t BoTt 1 sat t is worked out for slow changes in T t, at, and t. It is found that increasing Tt gives a relatively greater particle density incrte effect. Field variations constrained to preserve Tta2t and t leave t e form of the particle distributio unc a ged, increasing the density everywhere by the same factor. Comparing the theoretical results with the analysis by Fan, Meyer, and Simpson J. Geophys. Research, 66, 1961 of the large chanase in the center of the field than deep in the mirrors s at. The mirror distance retracts like 1T1 2. Decreasing at has the opposite effect. Field variations constrained to preserve Tta2t and t leave t e form of the particle distributio unc a ged, increasing the density everywhere by the same factor. Comparing the theoretical results with the analysis by Fan, Meyer, and Simpson J. Geophys. Research, 66, 1961 of the large changes in the outer Van Allen radiation zone during the magnetic activity of August 1960 shows that the changes in the particle den ity can be explained by a small increase of Tt with at fixed, and later by a decrease of a T so that Tta2t approxi ates to its initial value. No irreversible particle injec ion or acceleration appears necessary to explain th changes in the radiation zone. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE