Ducted compressional waves in the magnetosphere in the double-polytropic approximation

I Ballai, R Erdelyi, Bernard Roberts

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Small-amplitude compressional magnetohydro-dynamic-type waves are studied in the magnetosphere. The magnetosphere is treated as a rarefied plasma with anisotropy in the kinetic pressure distribution. The parallel and perpendicular pressures are defined by general polytropic pressure laws. This double-polytropic model can be considered as a natural extension of the magnetohydrodynamic (MHD) model when the plasma is collisionless.

Generalized dispersion relations for surface and body waves are derived and analyzed for an isolated magnetic slab. The waves are confined to the slab. For specific polytropic indices, the results obtained in the (i) Chew-Goldberger-Low (CGL) double-adiabatic and (ii) double-isothermal approximations are recovered.

Original languageEnglish
Pages (from-to)1553-1558
Number of pages6
JournalAnnales Geophysicae
Volume20
Publication statusPublished - Oct 2002

Keywords

  • magnetospheric physics
  • MHD waves and instabilities
  • plasma sheet
  • plasma waves and instabilities
  • ULF PULSATIONS
  • AMPTE CCE
  • STATISTICAL-ANALYSIS
  • INNER MAGNETOSPHERE
  • PROPAGATION
  • FIELD
  • PLASMA
  • GUIDES
  • RADAR
  • MODE

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