The pick-up of cometary protons by the solar wind

Details The pick-up of cometary protons by the solar wind The pick-up of cometary protons by the solar wind

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187...21n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 21-24. Previously announced in STAR as N87-19342.

Astronomy and Astrophysics

Astrophysics

33

Bow Waves, Halley'S Comet, High Energy Interactions, Protons, Shock Waves, Solar Wind, Elastic Scattering, Mass Spectrometers, Particle Trajectories, Photoionization

Scientific paper

The HERS detector of the Ion Mass Spectrometer on the Giotto spacecraft measured the 3-dimensional distribution of picked-up cometary protons over a distance of ≡8 million km upstream of the bow shock of comet P/Halley. The protons were observed to be elastically scattered out of their original cycloidal trajectories such that they were nonuniformly distributed over a spherical shell in velocity space. The shell radius (relative to its expected radius) and thickness increased as the bow shock was approached. Down-stream of the shock, the cometary protons could not be distinguished from the heated solar wind protons.

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