Swing wave-wave interaction: Coupling between fast magnetosonic and Alfven waves

T V Zaqarashvili, B Roberts

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We suggest a mechanism of energy transformation from fast magnetosonic waves propagating across a magnetic field to Alfven waves propagating along the field. The mechanism is based on swing wave-wave interaction [T. V. Zaqarashvili, Astrophys. J. Lett. 552, 107 (2001)]. The standing fast magnetosonic waves cause a periodical variation in the Alfven speed, with the amplitude of an Alfven wave being governed by Mathieu's equation. Consequently, subharmonics of Alfven waves with a frequency half that of magnetosonic waves grow exponentially in time. It is suggested that the energy of nonelectromagnetic forces, which are able to support the magnetosonic oscillations, may be transmitted into the energy of purely magnetic oscillations. Possible astrophysical applications of the mechanism are briefly discussed.

Original languageEnglish
Article number026401
Number of pages6
JournalPhysical Review. E, Statistical, nonlinear, and soft matter physics
Volume66
Issue number2
DOIs
Publication statusPublished - Aug 2002

Keywords

  • RESONANT ABSORPTION
  • CORONAL LOOPS
  • SHEAR FLOWS
  • FLUX TUBES
  • AMPLIFICATION
  • PROPAGATION

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