Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..849e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 849-852.
Astronomy and Astrophysics
Astrophysics
15
Cometary Atmospheres, Gas-Ion Interactions, Ionopause, Kelvin-Helmholtz Instability, Neutral Gases, Space Plasmas, Collisional Plasmas, Interplanetary Magnetic Fields, Ionospheres, Magnetohydrodynamic Stability, Plasma Interactions, Comets, Plasma, Interaction, Neutral Particles, Ionopause, Ions, Drag, Coupling, Damping, Waves, Velocity, Stability, Density, Magnetic Fields, Shear, Dayside, Calculations
Scientific paper
It is pointed out that plasma in the cometary ionosphere is collisionally coupled to neutrals which flow out from the nucleus. The present study is concerned with the effects of this coupling on the stability of the cometary ionopause. Because of this coupling, a damping of waves occurs. However, it is found that the coupling alone cannot quench the Kelvin-Helmholtz (K-H) instability, in contradiction to the assumption by Galeev and Lipatov (1984). Notwithstanding the plasma-neutral drag, the entire cometary ionopause can be subjected to the K-H instability. This situation might be responsible for the penetration of the interplanetary magnetic field into the cometary ionosphere, as it has been suggested by Ershkovich and Mendis (1983).
Ershkovich A. I.
Mendis Asoka D.
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