On the effect of a beam of energetic electrons on the whistler-mode growth rate due to gyroresonant interactions |
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| Institution: | 1. Physics Department, University of Bombay, Vidyanagari, Bombay 400098, India;2. College of Aeronautics, Cranfield Institute of Technology, Cranfield, Bedford MK43 0AL, U.K.;1. School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Beijing Laboratory of National Economic Security Early-warning Engineering, Beijing Jiaotong University, Beijing 100044, China;3. Department of Mathematics, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | The dispersion relation for whistler-mode waves in the presence of an idealised beam of energetic electrons that is moving either parallel or antiparallel to the gyroresonant electrons is analysed. The dependence of the real part of the dispersion relation on the velocity of the beam is shown to be responsible for an additional growth rate, for the beam antiparallel to the gyroresonant electrons, or for a reduced growth rate for the parallel condition. The effect could be important in explaining some features of VLF emissions such as hiss which propagate through the magnetosphere in the opposite direction to the gyroresonant electrons. |
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