Detection of a new 'chemical' boundary at Comet Halley

Details Detection of a new 'chemical' boundary at Comet Halley Detection of a new 'chemical' boundary at Comet Halley

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..613g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, July 1986, p. 613-616.

Physics

48

Cosmochemistry, Halley'S Comet, Space Plasmas, Discontinuity, Heavy Ions, Proton Energy, Solar Wind, Vega Project

Scientific paper

Plasma observations near comet Halley indicate that around 1.6×105km from the nucleus a newly discovered sharp boundary (cometopause) separates the solar wind controlled external and the heavy cometary ion dominated internal regions. Such a discontinuity was previously not predicted by theoretical models. Inside the cometopause (in the cometary plasma region) the protons and heavy ions move with different speeds: the heavy ion velocity is less than a few km/s throughout this region, while the protons decelerate from several tens of km/s (observed near the cometopause) to a few km/s (near 1.5×104km).

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