The stability of the cometary plasma tail and rays

Details The stability of the cometary plasma tail and rays The stability of the cometary plasma tail and rays

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986em%26p...36..127e&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 36, Oct. 1986, p. 127-134.

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4

Comet Tails, Cometary Atmospheres, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Wave Dispersion, Coupled Modes, Damping, Perturbation Theory, Strongly Coupled Plasmas

Scientific paper

The stability of both the main cometary plasma tail and the tail rays is considered, taking into account the coupling between the plasma and the neutrals that flow out radially from the nucleus. It is shown that this coupling has a negligible effect on wave damping. Rather, it was found that the neutral wind tends to destabilize the flanks of the main tail. On the other hand, the cometary rays are subject to both stabilizing and destabilizing effects because of the ion-neutrals drag. As a result, helical perturbations should become azimuthally asymmetric. The study predicts that the folding rays may become wavy while approaching the tail axis, whereas they should remain straight far away from the tail axis.

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