Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..981c&link_type=abstract
Astronomy and Astrophysics 288, 981-984 (1994)
Astronomy and Astrophysics
Astrophysics
18
Plasmas, Instabilities, Earth, Planets And Satellites: General
Scientific paper
A new excitation mechanism of auroral Langmuir and Alfven waves in the planetary magnetosphere is proposed. It is shown that a large-amplitude electromagnetic whistler wave propagating along the magnetic field lines can nonlinearly generate Langmuir and Alfven waves through three-wave parametric instabilities, provided the interacting waves satisfy the phase matching and wave helicity conservation conditions. The proposed mechanism can account for the observation of Langmuir-Alfven-whistler (LAW) auroral events in the Earth's magnetosphere. It is suggested that similar parametric processes are likely to occur in other field-aligned current regions of astrophysical plasmas wherein the electron plasma frequency is of the order of or less than the electron cyclotron frequency.
Alves Maria Virginia
Chian Abraham C. -L.
Lopes Sergio Roberto
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