Magnetohydrodynamic parametric instabilities driven by a standing Alfven wave in the planetary magnetosphere

Details Magnetohydrodynamic parametric instabilities driven by a standing Alfven wave in the planetary magnetosphere Magnetohydrodynamic parametric instabilities driven by a standing Alfven wave in the planetary magnetosphere

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286l...1c&link_type=abstract

Astronomy and Astrophysics 286L, L1-L4 (1994)

Astronomy and Astrophysics

Astrophysics

9

Magnetohydrodynamics (Mhd), Plasmas, Instabilities, Earth, Planets And Satellites: General

Scientific paper

The parametric instabilities driven by a standing Alfven wave of circular polarization are studied. Above a certain threshold amplitude, a standing Alfven wave can generate convective or purely growing MHD parametric processes. It is shown that the threshold conditions can be satisfied by the ULF waves in the planetary magnetospheres. Large density fluctuations and cavities may result from the ponderomotive interaction of Alfven and acoustic waves. Application of this theory to the observation of Alfven-acoustic turbulence in the Earth's auroral plasma is discussed.

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