TAIL FIELD EFFECTS ON DRIFT MIRROR INSTABILITY.

C. S. Lin, C. Z. Cheng

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)10771-10778
頁數8
期刊Journal of Geophysical Research
89
發行號A12
DOIs
出版狀態Published - 1984 一月 1

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 森林科學
  • 海洋學
  • 海洋科學
  • 生態學
  • 水科學與技術
  • 土壤科學
  • 地球化學與岩石學
  • 地表過程
  • 大氣科學
  • 地球與行星科學(雜項)
  • 空間與行星科學
  • 古生物學

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