Generation of Z mode radiation by diffuse auroral electron precipitation

Details Generation of Z mode radiation by diffuse auroral electron precipitation Generation of Z mode radiation by diffuse auroral electron precipitation

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.2915d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, March 1, 1985, p. 2915-2920.

Physics

6

Auroras, Cyclotron Frequency, Electron Precipitation, Propagation Modes, Electron Acceleration, Electron Distribution, Electron Spin, Plasma Frequencies, Refractivity, Satellite Observation, Wave Excitation

Scientific paper

The generation of Z mode waves by diffuse auroral electron precipitation is investigated assuming that a loss cone exists in the upgoing portion of the distribution due to electron interactions with the atmosphere. The waves are generated at frequencies above, but very near, the local electron cyclotron frequency omega(e) and at wave normal angles larger than 90 deg. In agreement with Hewitt et al. (1983), the group velocity is directed downward in regions where the ratio of the upper hybrid frequency omega(pe) to Omega(e) is less than 0.5, so that Z mode waves excited above a satellite propagate toward it and away from the upper hybrid resonance. Z mode waves are excited in a frequency band between Omega(e) and about 1.02 Omega(e), and with maximum growth rates of about 0.001 Omega(e). The amplification length is about 100 km, which allows Z mode waves to grow to the intensities observed by high-altitude satellites.

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