Stability of the Halley cometosheath with resistivity and plasma motion

Details Stability of the Halley cometosheath with resistivity and plasma motion Stability of the Halley cometosheath with resistivity and plasma motion

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815263s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A9, p. 15,263-15,273.

Physics

2

Cometary Atmospheres, Halley'S Comet, Interstellar Magnetic Fields, Magnetohydrodynamic Stability, Space Plasmas, Boundary Value Problems, Eigenvalues, Lorentz Force, Wave Equations

Scientific paper

The MHD stability of the cometary inner sheath determined by the balance between the inward Lorentz body force and the outward ion-neutral drag force is investigated by numerically solving the wave equations which include resistivity, plasma motion and plasma pressure with the help of two-point boundary value method. The eigenvalues and the eigenfunctions are obtained numerically by treating the cometary inner sheath as a layer of finite thickness, bounded by the contact surface, that is, the diamagnetic cavity boundary. To gain insight into the problem, certain limiting cases of the wave equations are also discussed. The diamagnetic cavity boundary and the adjacent layer of about 100-km thickness of Comet Halley is found to be unstable. The effects of finite plasma pressure, dissociative recombination, mass loading due to photoionization, resistivity, and plasma motion are found to be stabilizing but are unable to quench the instability completely. Motion of the Halley ionopause has been confirmed by observations.

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