Experimental evidence for the acceleration of thermal electrons by ion cyclotron waves in the magnetosphere

Details Experimental evidence for the acceleration of thermal electrons by ion cyclotron waves in the magnetosphere Experimental evidence for the acceleration of thermal electrons by ion cyclotron waves in the magnetosphere

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..889n&link_type=abstract

Journal of Geophysical Research, vol. 88, Feb. 1, 1983, p. 889-898. Research supported by the Science and Engineering Research

Other

21

Electron Acceleration, Hot Electrons, Ion Cyclotron Radiation, Magnetospheric Electron Density, Magnetospheric Ion Density, Plasma Waves, Energy Spectra, Statistical Analysis

Scientific paper

Experimental evidence is presented for the acceleration of thermal electrons by large amplitude ion cyclotron waves (ICWs). The wave power in the ULF range near the helium gyrofrequency is compared with the distribution function of low energy electrons measured by GEOS satellite instruments. This comparison shows that electrons are accelerated near the geomagnetic equator along field lines, at times when the ICW energy is large and the cold plasma density is below a threshold value. It is suggested that these accelerated electrons can account for the ELF emissions, modulated at the ICW frequency, observed by Wehrlin (1981). A very efficient acceleration of thermal electrons along field lines results from other ULF events having frequencies close to the proton gyrofrequency. Evidence for this lies in the fact that medium energy protons having large temperature anisotropies in the 100-500 eV range are responsible for the ICW wave generation.

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