Plasma Properties from the Upstream Regions to the Cometopause of Comet p/ Halley - VEGA Observations

Details Plasma Properties from the Upstream Regions to the Cometopause of Comet p/ Halley - VEGA Observations Plasma Properties from the Upstream Regions to the Cometopause of Comet p/ Halley - VEGA Observations

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..121v&link_type=abstract

Astronomy and Astrophysics, Vol. 187, NO. 1&2/NOV(I), P. 121, 1987

Astronomy and Astrophysics

Astrophysics

18

Scientific paper

Based on the Plasmag-1 plasma measurements on board Vega-1 and -2, evidence is provided for the deceleration upstream, for the heating at and for the thermalization and deceleration behind the bow shock of comet Halley. In the cometosheath region two separate ion populations are observed: the first one consists of cometary ions being picked up in the vicinity of the point of observation; the energy of these ions coming from the solar direction decreases much faster than the energy of the solar wind ions. The second one consists of cometary ions being picked up by the solar wind far away from the point of observation. Considerable oscillations in the plasma flow direction occur in the cometosheath region.

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