Interaction of electrostatic waves with warm electrons at the geomagnetic equator

Details Interaction of electrostatic waves with warm electrons at the geomagnetic equator Interaction of electrostatic waves with warm electrons at the geomagnetic equator

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..515g&link_type=abstract

Nature, vol. 279, June 7, 1979, p. 515-517. Research supported by the Science Research Council.

Physics

27

Electron Distribution, Electrostatic Waves, Magnetic Equator, Magnetospheric Electron Density, Plasma-Particle Interactions, Electron Energy, Geos 1 Satellite, Geos 2 Satellite, Gyrofrequency, Plasma Diagnostics, Plasma Layers, Satellite-Borne Instruments, Wave Amplification

Scientific paper

Observations of electron cyclotron harmonic waves at the geomagnetic equator at 6.6 earth radii are presented and discussed in relation to simultaneously observed low energy electron distributions. Four main classes of electron cyclotron harmonic emissions were detected by GEOS 2 at various times of the day and at various frequencies. The emissions observed for a long period after 01.00 UT, when cold plasma density rises and with a dominant frequency of up to 25 kHz, are found to be associated with narrow pitch angle distributions of electrons in the hundreds of eV range. It is suggested that these distributions are a remnant of the scattering of resonant electrons with small pitch angles during the amplification of electron cyclotron harmonic waves.

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