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Instability of Electromagnetic Ion Cyclotron Harmonic Waves in Plasmas

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1 Author(s)
Kai Fong Lee ; Department of Electronics the Chinese University of Hong Kong Shatin, N. T., Hong Kong

The stability of electromagnetic ion cyclotron harmonic waves propagating normal to an external magnetic field is studied for plasmas whose ions possess loss cone type velocity distributions. It is found that, if the ions are stationary, no instability develops except in the extreme case when the ratio of parallel to perpendicular "temperatures" of the ions is of the order mi/me, where mi and me are the ion and electron masses respectively. However, for the case of two counterstreaming ion beams in a neutralizing background of electrons, instability at zero frequency and near the first several ion cyclotron harmonics can occur if the streaming velocity is of the order of the electron thermal speed.

Published in:

IEEE Transactions on Plasma Science  (Volume:3 ,  Issue: 3 )