Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.305w&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 305-308 (SEE N87
Physics
1
Bow Waves, Giotto Mission, Halley'S Comet, Hydrogen Ions, Mass Spectrometers, Water, Atmospheric Ionization, Ion Distribution, Solar Wind
Scientific paper
Observations of cometary water group ions (A=16 to 18) at Halley's bow shock are presented. The analysis of the distribution function of heavy energetic pick-up ions shows that shell-like structures in velocity space exist. Quantitative figures for the shell filling factor are not available but there is evidence for substantial filling in the region upstream and inside the shock. Outside the bow shock the shell radius is equal to the local solar wind speed. The shell radius appears not to vary much as the spacecraft traversed the bow shock but the slowed down solar wind moved the shell across the spacecraft frame of reference. At the same time the temperature associated with the shell width increased from 5 million to 18 million K.
Amata Ermanno
Coates Allison
David Winningham J.
Formisano Vittorio
Jockers Klaus
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