Ion-Cyclotron Wave Heating of Heavy Ions in the Equatorial Magnetosphere: A Numerical Simulation Study

  1. T. E. Moore,
  2. J. H. Waite Jr.,
  3. T. W. Moorehead and
  4. W. B. Hanson
  1. M. W. Chen1,
  2. T. Hada2 and
  3. M. Ashour-Abdalla3

Published Online: 18 MAR 2013

DOI: 10.1029/GM044p0289

Modeling Magnetospheric Plasma

Modeling Magnetospheric Plasma

How to Cite

Chen, M. W., Hada, T. and Ashour-Abdalla, M. (1988) Ion-Cyclotron Wave Heating of Heavy Ions in the Equatorial Magnetosphere: A Numerical Simulation Study, in Modeling Magnetospheric Plasma (eds T. E. Moore, J. H. Waite, T. W. Moorehead and W. B. Hanson), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM044p0289

Author Information

  1. 1

    Department of Physics, University of California at Los Angeles, Los Angeles, California 90024

  2. 2

    Institute of Geophysics and Planetary Physics, University of California at Los Angeles, Los Angeles, California 90024

  3. 3

    Department of Physics, Institute of Geophysics and Planetary Physics, University of California at Los Angeles, Los Angeles, California 90024

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780875900704

Online ISBN: 9781118664414

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Keywords:

  • Space plasmas—Mathematical models;
  • Magnetosphere—Mathematical models;
  • Ionosphere—Mathematical models

Summary

The heating of cold H+ ions and heavy ions by electromagnetic ion-cyclotron waves (ICWs) in the ring current region of the equatorial magnetosphere is studied using a 1-2/2 dimensional hybrid numerical simulation code. In this study, we consider a plasma consisting of electrons, hot H+ ions, cold H+ ions, and cold heavy ions in which the ICWs are driven by the temperature anisotropy (T⊥ > T∥) of the hot protons. We found for large-amplitude ICWs that the cold H+ ions are preferentially heated over the heavy ions although the cold H+ ions are not initially resonant with the ICW. We propose that the cold H+ ions are heated by a three-step process. First, the large-amplitude ICW undergoes a resonant decay instability analogous to the decay instability of a large-amplitude Alfvén wave. The ICW will decay into daughter electromagnetic waves and an acoustic wave. Second, the cold H+ ions are heated in the parallel direction by Landau trapping with the generated acoustic waves. Finally, the increase of the parallel velocity of the cold H+ allows more cold H+ to be resonant with the ICW. Thus, the cold H+ can heat in the perpendicular direction also.