Excitation of low-frequency waves by auroral electron beams

Details Excitation of low-frequency waves by auroral electron beams Excitation of low-frequency waves by auroral electron beams

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1327l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1327-1337.

Physics

11

Auroral Zones, Electron Beams, Ion Cyclotron Radiation, Plasma-Particle Interactions, Wave Excitation, Distribution Functions, Dynamics Explorer 1 Satellite, Electron Distribution

Scientific paper

The electron distribution functions measured by the Dynamics Explorer 1 satellite during an auroral pass in 1981 are used in a linear instability analysis of low-frequency electromagnetic and electrostatic waves near and below the hydrogen gyrofrequency. It is suggested that the low-frequency electric and magnetic noise in the auroral zone might be explained by O and H electromagnetic ion cyclotron waves excited by energetic electron beams. An instability analysis suggests that upward and downward streaming electrons throughout the central plasma sheet region provide the free energy for heating oxygen ion through oxygen electrostatic ion cyclotron waves.

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