A theory of auroral hiss and implications on the origin of auroral electrons

Details A theory of auroral hiss and implications on the origin of auroral electrons A theory of auroral hiss and implications on the origin of auroral electrons

Mar 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..985s&link_type=abstract

Journal of Geophysical Research, vol. 80, Mar. 1, 1975, p. 985-992.

Physics

11

Auroras, Electron Energy, Electron Plasma, Plasma Waves, Cold Plasmas, Electron Beams, Group Velocity, Hiss, Night Sky, Radio Auroras, Satellite Observation, Very Low Frequencies, Wave Dispersion, Whistlers

Scientific paper

A theory of auroral hiss is developed based on the existence of a beam of energetic particles that is assumed to be responsible for the visual aurora as well. A dispersion relation for electromagnetic waves in a plasma consisting of an electron beam and a background plasma is derived. It is shown that the electron beam can excite an electron whistler mode instability near the resonance cone by the Landau interaction because near the resonance cone the phase velocity of the wave can be made arbitrarily small. The results of the calculations are applied to auroral hiss observations. From the fact that auroral hiss is observed on the ground at frequencies less than 10 kHz it is concluded that at least some of the auroral hiss is generated at altitudes where the ambient electron density is of the order of 1/cu cm. This suggests that auroral electrons are energized in regions where the ambient density is of the order of 1/cu cm or less.

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