TAIL FIELD EFFECTS ON DRIFT MIRROR INSTABILITY.

C. S. Lin, C. Z. Cheng

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The effects of geomagnetic tail fields on drift mirror instability are studied for a magnetic field model that contains a magnetic gradient and a tail field perpendicular to an ambient field. The magnetospheric plasma is assumed to consist of a cold component and a high beta anisotropic inhomogeneous component. The gyrokinetic equations are used to derive the dispersion equation including the effects of magnetic gradient and curvature drifts. The dispersion equation is solved locally for wave frequencies less than the ion gyrofrequency. The numerical results indicate that the instability growth rate decreases when the tail field strength increases. The drift mirror instability is found to be stabilized when larger tail fields require a smaller pressure anisotropy and a smaller plasma to maintain equilibrium. The theoretical results are used to explain the GOES satellite observations that storm time Pc 5 waves occur less frequently during periods of large tail fields.

Original languageEnglish
Pages (from-to)10771-10778
Number of pages8
JournalJournal of Geophysical Research
Volume89
Issue numberA12
DOIs
Publication statusPublished - 1984 Jan 1

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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