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

Published online by Cambridge University Press:  21 January 2010

R. BINGHAM
Affiliation:
Rutherford Appleton Laboratory, Chilton, Oxon, OX11 0QX, UK (bob.bingham@stfc.ac.uk) Department of School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife, Scotland, KY16 9SS
R. A. CAIRNS
Affiliation:
Department of School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife, Scotland, KY16 9SS
I. VORGUL
Affiliation:
Department of School of Mathematics and Statistics, University of St Andrews, St Andrews, Fife, Scotland, KY16 9SS
V. D. SHAPIRO
Affiliation:
Department of Physics, University of California, San Diego, La Jolla, CA 92091, USA

Abstract

This paper describes some 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.

Type
Papers
Copyright
Copyright © Cambridge University Press 2010

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