Expansion velocity and temperatures of gas and ions measured in the coma of Comet Halley

Details Expansion velocity and temperatures of gas and ions measured in the coma of Comet Halley Expansion velocity and temperatures of gas and ions measured in the coma of Comet Halley

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.179l&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 179-182 (SEE N87

Physics

15

Gas Expansion, Gas Temperature, Halley'S Comet, Ion Temperature, Plasma Temperature, Temperature Measurement, Velocity Measurement, Energy Spectra, Flow Velocity, Giotto Mission

Scientific paper

In situ measurements of flow velocity and temperature in the inner coma were obtained from ram energy spectra of molecules and ions observed by the Giotto neutral mass spectrometer. Radial flow speed is 800 km/sec; near 2,500 km from the nucleus increasing to more than 1000 m/sec at 20,000 km. A near zero volt spacecraft potential was inferred. Ion temperatures are approx. 200 K inside the contact surface (approx. 4500 km) where the plasma is collisionally coupled to the gas; at this boundary ion temperature rises by approx. 1000 K. The observations indicate a heat source which is effective to large distances.

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