The cometopause region at Comet Halley

Details The cometopause region at Comet Halley The cometopause region at Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.213a&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 213-218 (SEE N87

Physics

4

Discontinuity, Halley'S Comet, Plasma-Particle Interactions, Solar Wind, Cometary Atmospheres, Giotto Mission, Space Plasmas

Scientific paper

Evidence that the cometopause region is bounded by the cometopause itself is presented. In the last part of the inbound Giotto trajectory, the JPA experiment observed 2 discontinuities not forecast by models: the first, at 23:30 GRT, characterized by a drop of solar wind speed and an increase of cometary ion count rate; the second, at 23:56 GRT, by the disappearance of the solar wind flow. Between the discontinuities solar wind protons are heated and cometary ions appear as a beam close to the ram direction with a large thermal spread; ions of different masses, up to the water-group, are seen at the same energy E approx. 400 eV. After the second discontinuity, all cometary ions have energies corresponding to the ram velocity.

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