The global interaction of comets with the solar wind

Physics

Scientific paper

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Cometary Atmospheres, Interplanetary Medium, Intervals, Shock Wave Interaction, Solar Wind, Bow Waves, Giacobini-Zinner Comet, Halley'S Comet, Ionopause

Scientific paper

The recent in-situ measurements of the plasma-neutral gas environment of comet Halley by the GIOTTO and VEGA spacecraft have confirmed the global theory of the comet-solar wind interaction. The ionopause, cometopause, and bow shock distances are the primary predictions of the model, although various momentum collisional cross-sections can also be estimated. With this greater confidence in the global model, the sharp Sunward intensity decrease in the spatial H2O+ profiles observed for comet Halley between 2.14 AU pre- and post-perihelion are interpreted as the cometopause boundary. This interpretation may then be used to determine the solar wind conditions local to the comet.

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