Parametric Processes of Lower Hybrid Waves in Multicomponent Auroral Plasmas

  1. Tom Chang,
  2. M. K. Hudson,
  3. J. R. Jasperse,
  4. R. G. Johnson,
  5. P. M. Kintner and
  6. M. Schulz
  1. Hannu E. J. Koskinen

Published Online: 21 MAR 2013

DOI: 10.1029/GM038p0291

Ion Acceleration in the Magnetosphere and Ionosphere

Ion Acceleration in the Magnetosphere and Ionosphere

How to Cite

Koskinen, H. E. J. (1986) Parametric Processes of Lower Hybrid Waves in Multicomponent Auroral Plasmas, in Ion Acceleration in the Magnetosphere and Ionosphere (eds T. Chang, M. K. Hudson, J. R. Jasperse, R. G. Johnson, P. M. Kintner and M. Schulz), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM038p0291

Author Information

  1. Uppsala Ionospheric Observatory, S-755 90 Uppsala, Sweden

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1986

ISBN Information

Print ISBN: 9780875900636

Online ISBN: 9781118664216

SEARCH

Keywords:

  • Magnetosphere—Congresses;
  • Ionosphere—Congresses;
  • Ion flow dynamics—Congresses;
  • Space plasmas—Congresses

Summary

Parametric instabilities of lower hybrid waves are considered in multicomponent plasmas. The plasma parameters are chosen to correspond to plasmas on auroral field lines at altitudes where acceleration of ionospheric ions perpendicular to the geomagnetic field is expected to take place. Since the wave vector matching is difficult to satisfy under such conditions, parametric coupling through nonresonant quasi-modes becomes important. At altitudes of 2000–3000 km, the threshold wave electric fields for such processes are found to be on the order of l mV/m. These values are within the measured amplitudes of lower hybrid waves and it is suggested that parametric processes convert the keV auroral electron beam driven lower hybrid waves into waves of lower phase velocity perpendicular to the geomagnetic field, thus producing waves that are more effective in the transverse acceleration of ions.