Specific Entropy and Radiation-Belt Electrons

Details Specific Entropy and Radiation-Belt Electrons Specific Entropy and Radiation-Belt Electrons

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm14b..04b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM14B-04

Physics

[2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Specific entropy is a quantity commonly used for fluid behavior. It is shown for single-particle motion in a magnetic mirror that the specific entropy of a particle population is related to the number density of first and second adiabatic invariants per unit magnetic flux. The specific entropy is measured for two populations: the outer electron radiation belt at geosynchronous orbit and the energetic-electron population in the magnetotail. The two specific entropies are similar, arguing that the tail and geosynchronous populations are the same. This sameness implies that either (A) the tail electrons are the source population for the radiation belt or (B) that the tail electrons are leaked from the radiation belt. Examination of the temporal behaviors of the two populations will argue for case B.

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