A test particle model of pickup ions at comet Halley

Details A test particle model of pickup ions at comet Halley A test particle model of pickup ions at comet Halley

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7532l&link_type=abstract

Journal of Geophysical Research, Volume 93, Issue A7, p. 7532-7537

Physics

12

Planetology: Comets And Small Bodies: Interactions With Solar Wind Plasma And Fields, Magnetospheric Physics: Solar Wind Interactions With Unmagnetized Bodies

Scientific paper

A test particle treatment is used to investigate some of the details of the pickup cometary ions observed at comet Halley. The effects of the large-scale magnetic and motional electric fields, as described by an MHD model of the comet, produce the characteristic V shape seen in Giotto observations in simulated energy-time spectrograms. It is demonstrated that scattering produced by the addition of magnetic field fluctuations can obscure the tendency of the large-scale field to deflect energetic ions picked up in the outer coma from the tail axis. The fact that the V is so clearly observed in the Giotto spectrogram thus suggests that although scattering must be invoked to explain the isotropic pitch angle distributions and highest energy ions, it does not have a major effect on the overall pickup ion spectrum.

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