A new cyclotron maser radiation mechanism in space plasmas

R Bingham, R A Cairns

Research output: Contribution to journalArticle

Abstract

In this paper, we discuss a new cyclotron maser type instability driven by a crescent or horseshaped electron distribution function. Such distribution functions are easily created by an electron beam moving into a stronger magnetic field region, where conservation of the first adiabatic invariant causes an increase in their pitch angle. This produces a broad region on the distribution function where ∂fe/∂v⊥ > 0. Planetary dipole magnetic fields are examples of where these types of distributions can be found. We examine the stability of these electron horseshoe distribution functions for right-hand extraordinary mode (R–X mode) radiation close to the electron cyclotron frequency propagating perpendicular to the magnetic field using both non-relativistic and relativistic beams.
Original languageEnglish
Pages (from-to)160-162
Number of pages3
JournalPhysica Scripta
VolumeT98
DOIs
Publication statusPublished - 2002

Keywords

  • microinstabilities
  • plasma interactions
  • radiation mechanisms
  • polarization

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