Critical electron pitch angle anisotropy necessary for chorus generation

Details Critical electron pitch angle anisotropy necessary for chorus generation Critical electron pitch angle anisotropy necessary for chorus generation

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.4779b&link_type=abstract

Journal of Geophysical Research, vol. 81, Sept. 1, 1976, p. 4779-4781.

Physics

8

Cyclotron Resonance, Dawn Chorus, Doppler Effect, Electron Radiation, Pitch (Inclination), Anisotropy, Magnetohydrodynamic Stability, Ogo-5, Satellite Observation, Whistlers

Scientific paper

Simultaneous wave, resonant-particle, and ambient-plasma data from OGO 5 for chorus emissions on August 15, 1968, were found consistent with the theoretical critical pitch-angle-anisotropy condition for whistler-mode instability by Doppler-shifted electron cyclotron resonance. Local generation, as determined by wave normal measurements, occurred only when the pitch-angle anisotropy of resonant electrons required for instability substantially exceeded the critical anisotropy defined by Kennel and Petschek (1966).

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