Observations of electron distributions in magnetosheath mirror mode waves

Details Observations of electron distributions in magnetosheath mirror mode waves Observations of electron distributions in magnetosheath mirror mode waves

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326765c&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A11, p. 26765-26774

Physics

Plasma Physics

10

Magnetospheric Physics: Magnetosheath, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Waves And Instabilities

Scientific paper

The behavior of the electron distribution function within mirror mode waves in the Earth's magnetosheath is studied using observations made by the electron experiment on Active Magnetospheric Particle Tracer Explorers United Kingdom Subsatellite (AMPTE UKS). The results of a detailed pitch angle analysis show that in the mirror mode troughs the electron distribution displays two distinct features related to particle trapping: (1) The ``deeply'' trapped electrons (those with pitch angles close to 90° in the magnetic field troughs) are significantly cooled with respect to the rest of the electron population and (2) the ``shallowly'' trapped electrons (those with pitch angles just greater than the critical pitch angle for trapping) are significantly heated with respect to the rest of the electron population. This is explained as a result of the trapped electron population undergoing a combination of Fermi acceleration and deceleration and betatron deceleration. The untrapped electron population appears to behave adiabatically as it travels alternately through mirror mode peaks and troughs. This behavior is confirmed by the use of Liouville mapping techniques, which also allow us to estimate the electric potential associated with the mirror mode wave.

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