The stability of inner cometo-sheath with large Larmor radius effects

Details The stability of inner cometo-sheath with large Larmor radius effects The stability of inner cometo-sheath with large Larmor radius effects

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.207..249s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 207, no. 2, p. 249-268

Astronomy and Astrophysics

Astrophysics

Cometary Atmospheres, Giacobini-Zinner Comet, Halley'S Comet, Larmor Radius, Magnetohydrodynamic Stability, Plasma Sheaths, Solar Wind, Conservation Equations, Lorentz Force, Magnetic Field Configurations, Magnetohydrodynamics, Photoionization, Plasma Pressure

Scientific paper

An investigation of the linear stability of the cometary inner sheath, the boundary layer surrounding the ionopause which separates the outflowing unmagnetized plasma from an inflowing magnetized plasma, has been carried out by taking into account the large Larmor radius effects. The structure of the boundary layer is determined by the balance between an outward ion-neutral collisional drag force and an inward magnetic stress. The eigenvalues and the eigenfunctions are obtained numerically by treating the cometary ionosphere as a layer of finite thickness, bounded by the contact surface, i.e., the diamagnetic cavity boundary. Certain limiting cases of the wave equations are also discussed. In general, the cometary ionosphere is structurally linearly unstable and the effects of recombination, photoionization, plasma pressure, though stabilizing are unable to quench the instability completely. The large Larmor radius also has a destabilizing effect on the system. The instability of the cometosheath is further proved by the tauc/taui assuming a value greater than 30 that is sufficient for the convection of perturbations down into the cavity surface and this is in agreement with the observations of ripples in the ionopause.

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