Abstract
The effect of parallel electric field on the growth rate, parallel and perpendicular resonant energy of the electromagnetic ion-cyclotron (EMIC) waves with general loss-cone distribution function in hot anisotropic plasma in auroral acceleration region is investigated by particle aspect approach. The ion beam driven by parallel electric field is included in the analysis whereas electrons are assumed mixed with the back ground plasma. Plasma consisting of resonant and non-resonant particles has been considered. It is assumed that the resonant particle and ion beam participate in energy exchange with the wave, whereas non-resonant particles support the oscillatory motion of the wave. We observed that the parallel electric field is to control the growth rate of the EMIC wave, whereas the effect of steep loss-cone distribution is to enhance the growth rate and perpendicular heating of the ions. This study is relevant to analyse the broad scenario of EMIC waves in the auroral acceleration region of the earth’s magnetoplasma.
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