Generation of waves in the Venus mantle by the ion acoustic beam instability

Details Generation of waves in the Venus mantle by the ion acoustic beam instability Generation of waves in the Venus mantle by the ion acoustic beam instability

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1751h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 17, p. 1751-1754.

Physics

15

Ion Acoustic Waves, Magnetohydrodynamic Stability, Planetary Mantles, Plasma Turbulence, Venus Surface, Wave Generation, Ion Beams, Solar Wind

Scientific paper

The ion acoustic beam instability is suggested as a mechanism to produce wave turbulence observed in the Venus mantle at frequencies 100 Hz and 730 Hz. The plasma is assumed to consist of a stationary cold O(+) ion plasma and a flowing, shocked solar wind plasma. The O(+) ions appear as a beam relative to the flowing ionosheath plasma which provides the free energy to drive the instability. The plasma is driven unstable by inverse electron Landau damping of an ion acoustic wave associated with the cold ionospheric O(+) ions. The instability can directly generate the observed 100 Hz waves in the Venus mantle as well as the observed 730 Hz waves through the Doppler shift of the frequency caused by the satellite motion.

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