A laboratory experiment to investigate auroral kilometric radiation emission mechanisms

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Abstract

If an initially mainly rectilinear electron beam is subject to significant magnetic compression, the conservation of the magnetic moment results in the ultimate formation of a horseshoe distribution in phase space. A similar situation occurs where particles are accelerated into the auroral region of the Earth's magnetic dipole. Such a distribution has been shown to be unstable to a cyclotron resonance maser type of instability and it has been postulated that this may be the mechanism required to explain the production in these regions of auroral kilometric radiation (AKR) and also possibly radiation from other astrophysical objects such as stars with a suitable magnetic field configuration. In this paper we describe a laboratory experiment to investigate the evolution of an electron beam subject to a magnetic compression of up to a factor of 30.
Original languageEnglish
Pages (from-to)665-674
Number of pages9
JournalJournal of Plasma Physics
Volume71
Issue number5
DOIs
Publication statusPublished - Oct 2005

Keywords

  • rectilinear electron beam
  • magnetic compression
  • cyclotron resonance maser
  • auroral kilometric radiation
  • plasma

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