The authors present the first in situ observations and a description of the large-scale behaviour of comet Halley's plasma environment. They observed a discontinuity (the "cometopause") between the solar-wind-controlled cometosheath and the magnetized cometary plasma region. From the measured neutral gas density distribution the authors estimate a total gas production rate of 1.3×1030molecules s-1.
Pisma v Astronomicheskii Zhurnal
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