Accession Number:

AD0261849

Title:

PROTON LIFETIMES IN THE VAN ALLEN RADIATION BELTS

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s):

Report Date:

1961-06-01

Pagination or Media Count:

1.0

Abstract:

Several loss mechanisms limit the lifetimes of protons in the inner and outer Van Allen radiation belts. During geomagnetically quiet periods the principal mechanisms are believed to be charge exchange and coulomb scattering. Specific density models for the neutral and charged components of the background exosphere are employed in order to made an absolute comparison of these two mechanisms. It is shown that charge exchange is dominant for proton energies from 2 to 200 kev giving equatorial lifetimes of about one day in the outer belt. At higher energies the protons have lifetimes of the order of years from these loss mechanisms. The dependence of the lifetimes on the mirror latitude lambda sub m of the trapped protons is given approximately by cos to the 6th power lambda sub m. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE