Giotto / IMS Observations of Ion Flow Velocities and Temperatures Outside the Magnetic Cavity of Comet p/ Halley

Details Giotto / IMS Observations of Ion Flow Velocities and Temperatures Outside the Magnetic Cavity of Comet p/ Halley Giotto / IMS Observations of Ion Flow Velocities and Temperatures Outside the Magnetic Cavity of Comet p/ Halley

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..174g&link_type=abstract

Astronomy and Astrophysics, Vol. 187, NO. 1&2/NOV(I), P. 174, 1987

Astronomy and Astrophysics

Astrophysics

20

Scientific paper

Fluid parameters for He2+ 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 approach. A bow shock transition lasting ten minutes is observed. A region of enhanced He2+ 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 are also sharp drops in alpha particle density and temperature at 23:30. There is a relative flow velocity between alpha particles and oxygen ions of approximately 20 km s-1 during a period roughly from 22:55 to 23:10; by 23:30 the difference in flow velocity is less than the experimental uncertainities.

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