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Generation of Extra‐Ordinary Mode Radiation by an Electrostatic Pump in a Two‐Electron‐Temperature Plasma
Author(s) -
Hasan Zehra,
Guha S.
Publication year - 1991
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150310403
Subject(s) - physics , plasma , electron , atomic physics , dispersion relation , lower hybrid oscillation , magnetosphere , instability , computational physics , electron temperature , ion , electromagnetic electron wave , optics , mechanics , nuclear physics , quantum mechanics
Coherent wave‐wave coupling can produce radiation with a high efficiency. Recently, there has been a great deal of interest in the study of electro‐magnetic wave generation in magnetized plasmas. We have investigated theoretically the effect of finite ion temperature on the parametric instability of an electro‐static upperhybrid pump into an X‐mode nonthermal radiation and low frequency ion waves in a two electron temperature plasma. The latter may include the lower‐hybrid, the electron‐acoustic and the ion‐cyclotron waves. The loss cone distribution existing permanently at low altitudes acts as a free energy source generating the upper‐hybrid waves. The upper‐hybrid waves can also be present because of a linear instability produced by runaway electrons. Nonlinear dispersion relation and the growth rates are derived for each case using the hydrodynamical model. We find extra numerical factor arising due to the ions of finite temperature in the growth rate expression. This study may be useful in magnetosphere, auroral ionosphere, solar wind, solar radio bursts, and laboratory plasmas where ion has finite temperature and electrons have two distinct energy distributions.