The flow in the cometosheath of comet Halley

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cometary Atmospheres, Cometary Magnetospheres, Halley'S Comet, Ionopause, Magnetic Fields, Magnetohydrodynamic Flow, Plasma Sheaths, Electron Recombination, Electrons, Ions, Comets, Halley, Cometosheath, Flow, Model, Parameters, Mass Loading, Recombination, Magnetic Field, Drag, Ions, Ionopause, Calculations, Magnetohydrodynamics, Velocity, Density, Temperature, Acceleration, Theoretical Studies, Comparison, Cometopause

Scientific paper

A quasi-one-dimensional, single-fluid model is used to examine the cometosheath flow along the Sun-comet axis at comet, Halley. The effects of mass loading, dissociative recombination, magnetic field line curvature, ion-neutral drag, and flow divergence on the submagnetosonic flow in this region are discussed. In particular, the inclusion of the flow divergence, which is achieved by allowing the central flow tube area to increase toward the comet, is necessary to bring the cometosheath flow to stagnation at the subsolar point of the ionopause. The cometosheath flow and field profiles are determined for two assumed values of the electron-ion dissociative recombination rate. The model calculations performed using the higher recombination rate are shown to be in better agreement with the Giotto data at comet Halley.

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