Observational test of local proton cyclotron instability in the Earth's magnetosphere

Details Observational test of local proton cyclotron instability in the Earth's magnetosphere Observational test of local proton cyclotron instability in the Earth's magnetosphere

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10121527a&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A10, p. 21527-21544

Physics

Plasma Physics

47

Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Magnetosphere-Outer, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

We present a study of the proton cyclotron instability in the Earth's outer magnetosphere, L>7, using Active Magnetosphere Particle Tracer Explorers/Charge Composition Explorer (AMPTE/CCE) magnetic field, ion, and plasma wave data. The analysis addresses the energy of protons that generate the waves, the ability of linear theory to predict both instability and stability, comparison of the predicted wave properties with the observed wave polarization and frequency, and the temperature anisotropy/parallel beta relation. The data were obtained during 24 intervals of electromagnetic ion cyclotron (EMIC) wave activity (active) and 24 intervals from orbits without EMIC waves (quiet). This is the same set of events used by Anderson and Fuselier [1994]. The active events are drawn from noon and dawn local times for which the wave properties are significantly different. For instability analysis, magnetospheric hot proton distributions required the use of multiple populations to analytically represent the data. Cyclotron waves are expected to limit the proton temperature anisotropy, Ap=T⊥p/T∥p-1, according to Ap

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