Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989angeo...7...91d&link_type=abstract
Annales Geophysicae (ISSN 0980-8752), vol. 7, Feb. 1989, p. 91-96.
Physics
14
Electron Distribution, Electron Energy, Electron Plasma, Halley'S Comet, Energy Spectra, Giotto Mission, Interplanetary Magnetic Fields, Space Plasmas, Vega Project
Scientific paper
In the environment of comet P/Halley, a sharp transition, named the cometopause, was detected by the Vega and Giotto spacecraft around 170,000 km from the nucleus. This boundary separates the outer region of the cometosheath controlled by the solar wind from the inner region of cometary plasma. In electron measurements provided by the Giotto RPA experiment, a clear discontinuity was detected 20 percent closer to the nucleus than the cometopause as seen in the ion measurements and coincided with an abrupt increase of the magnetic-field magnitude when the field lines began to pile up. Significant changes in the electron distribution function through this discontinuity and within the following region down to 45,000 km from the nucleus are presented. The main changes noted at the electron plasma discontinuity were a decrease of the density above 10 eV and a modification of the distribution function which turned from isotropic to anisotropic.
Anderson Katharine A.
Carlson Carl W.
D'Uston Claude
Reme Henri
Sauvaud Jean-Andre
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