Abstract
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).
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