Pick-up ions at Comet P/Halley's bow shock - Observations with the IIS spectrometer on Giotto

Details Pick-up ions at Comet P/Halley's bow shock - Observations with the IIS spectrometer on Giotto Pick-up ions at Comet P/Halley's bow shock - Observations with the IIS spectrometer on Giotto

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..153w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 153-159. Research supported by the Swedish Board f

Astronomy and Astrophysics

Astrophysics

9

Bow Waves, Giotto Mission, Halley'S Comet, Ion Density (Concentration), Mass Spectrometers, Shock Waves, Comet Nuclei, Heavy Ions, Ion Scattering, Radial Distribution, Solar Radiation, Solar Wind

Scientific paper

Gaseous material expanding from the nucleus of Comet Halley into space forms the neutral coma around the comet. Ionization in the solar UV radiation removes particles from the coma and injects them into the solar wind plasma. These freshly created ions are accelerated by the interplanetary electric field on cycloidal trajectories with gyrocenters moving with the speed of the magnetic field lines. In the solar wind frame of reference these particles move along the magnetic field lines with a fixed pitch angle. Pitch-angle scattering and energy diffusion reduce quickly the initial energy anisotropy which is associated with the narrow pick-up structures. First observations of heavy cometary pick-up ions (water group ions) at the bow shock are presented. The evolution of the distribution function in the vicinity of the shock and radial density profiles are discussed.

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