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On the generation of quasi-electrostatic half-electron-gyrofrequency VLF emissions in the magnetosphere

Published online by Cambridge University Press:  13 March 2009

Norichika Ohmi  and
Masashi Hayakawa
Norichika Ohmi
Affiliation:
Research Institute of Atmospherics, Nagoya University, Toyokawa, Aichi, 442, Japan
Masashi Hayakawa
Affiliation:
Research Institute of Atmospherics, Nagoya University, Toyokawa, Aichi, 442, Japan
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Abstract

A theoretical study is made of the generation mechanism of quasi-electrostatic VLF emissions observed in the distant magnetosphere, with frequency greater than half the electron gyrofrequency and with wave normal around the cold plasma oblique resonance cone. The two-component plasma is treated, composed of cold electrons and hot electrons with bi-Maxwellian and loss-cone distribution functions. The effects of various plasma parameters on the instability characteristics are examined in order to estimate their relative importance in determining the properties of unstable waves. It is found that both types of hot plasma distribution function can account for quasi-electrostatic half-gyrofrequency emissions. The frequency where the maximum growth rate occurs is mainly determined by the temperature anisotropy of the hot plasma, and the wave normal angle where maximum growth is expected is determined by the temperature of the hot plasma and the ratio of the cold to hot plasma densities. These theoretical considerations form the basis of a suggested plasma model which is able to explain our experimental direction-finding results.

Type
Research Article
Information
Journal of Plasma Physics , Volume 35 , Issue 3 , June 1986 , pp. 351 - 373
Copyright
Copyright © Cambridge University Press 1986

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