Alfven wave instabilities and ring current during solar wind-comet interaction

Details Alfven wave instabilities and ring current during solar wind-comet interaction Alfven wave instabilities and ring current during solar wind-comet interaction

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.143..329l&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 143, no. 2, April 1988, p. 329-338.

Astronomy and Astrophysics

Astrophysics

14

Comets, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Plasma Interactions, Ring Currents, Solar Wind, Cometary Atmospheres, Plasma Drift

Scientific paper

This paper deals with the incorporation of the ring current into a self-consistent description of Alfvén mode instabilities in drifting plasmas, as encountered during solar wind-comet interaction. The distribution of the picked-up cometary ions contains two sources of free energy, namely a ring in velocity space perpendicular to the solar wind magnetic field and a parallel drift relative to the solar wind protons. Both can excite Alfvénic mode instabilities in different parameter regimes. For the purely growing, nondispersive modes the parallel drifts are destabilizing, whereas the ring current has a stabilizing influence.

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