Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.229g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 229-233 (SEE N87
Physics
2
Flow Velocity, Giotto Mission, Halley'S Comet, Helium Ions, Ion Temperature, Mass Spectrometers, Alpha Particles, Heavy Ions, Proton Density (Concentration)
Scientific paper
Fluid parameters for He++ ions obtained from the GIOTTO ion mass spectrometer HERS sensor are presented; also investigated are proton densities and velocities and thermal speeds of protons, alpha particles, and heavy ions in the hour before closest appraoch. A region of enhanced He++ ion densities, and velocity, and decreased temperature is observed from 20:26 to 21:45. Sharp decreases in the proton density are observed at 23:30 and at 23:41. There is a relative flow velocity between alpha particles and oxygen ions of approximately 30 km/sec during a period roughly from 22:55 to 23:10; by 23:30 the difference in flow velocity is less than the experimental uncertainties. The flow properties of protons observed during this period are also discussed.
Balsiger Hans
Drake Jeremy J.
Fuselier Stephen A.
Goldstein Bruce E.
Goldstein Raymond
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