Lower-hybrid waves generated by anomalous Doppler resonance in auroral plasmas

Bingham, R. and Cairns, R. A. and Vorgul, I. and Shapiro, V. D. (2010) Lower-hybrid waves generated by anomalous Doppler resonance in auroral plasmas. Journal of Plasma Physics, 76 (3-4). pp. 539-546. ISSN 0022-3778

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Abstract

This paper describes sonic aspects of lower-hybrid wave activity in space plasmas. Lower-hybrid waves are particularly important since they can transfer energy efficiently between electrons and ions in a collisionless magnetized plasma. We consider the 'fan' or anomalous Doppler resonance instability driven by energetic electron tails and show that it is responsible for the generation of lower-hybrid waves. We also demonstrate that observations of their intensity are sufficient to drive the modulational instability.