Wave intensifications near the electron cyclotron frequency within the polar cusp

Details Wave intensifications near the electron cyclotron frequency within the polar cusp Wave intensifications near the electron cyclotron frequency within the polar cusp

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6493f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6493-6504.

Physics

10

Cyclotron Frequency, Electron Cyclotron Heating, Electrostatic Waves, Particle Energy, Polar Cusps, Earth Magnetosphere, Magnetosheath, Plasma Waves, Very Low Frequencies

Scientific paper

As DE 1 flew through the polar cusp, enhanced narrowband electrostatic waves were sometimes observed just above the electron cyclotron frequency. Here, wave and particle measurements from three representative cusp transits are presented in order to characterize these signals and understand the conditions that favor their generation. It was found that the form of the local cusp electron velocity distribution had a direct influence on the wave spectral character. A preliminary study indicates that electron beams in the cusp can generate the enhanced signals, although generation by an anisotropic warm component cannot be ruled out.

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