Other
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..293k&link_type=abstract
Geophysical Research Letters, vol. 7, May 1980, p. 293-296.
Other
4
Cyclotron Radiation, Electrostatic Waves, Free Energy, Harmonic Radiation, Magnetohydrodynamic Stability, Resonant Frequencies, Upper Atmosphere, Distribution Functions, Electron Distribution, Hawkeye Satellites, Velocity Distribution
Scientific paper
Significant progress has been made in understanding intense electrostatic waves near the upper hybrid resonance frequency in terms of the theory of multiharmonic cyclotron emission using a classical loss-cone distribution function as a model. Recent observations by Hawkeye 1 and GEOS 1 have verified the existence of loss-cone distributions in association with the intense electrostatic wave events, however, other observations by Hawkeye and ISEE have indicated that loss cones are not always observable during the wave events, and in fact other forms of free energy may also be responsible for the instability. Now, for the first time, a positively sloped feature in the perpendicular distribution function has been uniquely identified with intense electrostatic wave activity. Correspondingly, we suggest that the theory is flexible under substantial modifications of the model distribution function.
Ashour-Abdalla Maha
Burek B. G.
Frank Louis A.
Gurnett Donald A.
Kurth Willaim S.
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