Plasma-beam instabilities in cometary ionospheres

Details Plasma-beam instabilities in cometary ionospheres Plasma-beam instabilities in cometary ionospheres

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sval...18...35v&link_type=abstract

Soviet Astronomy Letters, Vol. 18, p. 35; Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 18, no. 1, Jan. 1992, p. 81-8

Astronomy and Astrophysics

Astronomy

Cometary Atmospheres, Ion Acoustic Waves, Magnetohydrodynamic Stability, Plasma Interactions, Plasma Waves, Solar Wind, Ionospheres, Magnetohydrodynamic Waves, Plasma Density

Scientific paper

It is shown that the interaction of a solar wind flux with a cometary plasma occurs in the mixing region and results in the excitation of a wide spectrum of plasma waves, namely, ion acoustic waves with the frequency of the ion Langmuir order, electron-cyclotron waves with the intensity maximum on a lower hybrid frequency, whistler, and magnetoacoustic waves. The frequency spectrum is investigated. The linear increase increment and lengths of excited waves are found. It is also shown that under certain conditions a filamentary instability yielding magnetic field space fluctuations and plasma density fluctuations with a characteristic scale of tens of kilometers may develop.

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