Electron plasma environment at comet Grigg-Skjellerup: General observations and comparison with the environment at comet Halley

Details Electron plasma environment at comet Grigg-Skjellerup: General observations and comparison with the environment at comet Halley Electron plasma environment at comet Grigg-Skjellerup: General observations and comparison with the environment at comet Halley

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9820965r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 20,965-20,976

Astronomy and Astrophysics

Astronomy

35

Electron Plasma, Grigg-Skjellerup Comet, Halley'S Comet, Plasma Interactions, Shock Wave Interaction, Solar Wind, Spaceborne Astronomy, Astronomical Spectroscopy, Electron Spectroscopy, Giotto Mission, Negative Ions, Positive Ions, Shock Waves

Scientific paper

The three-dimensional electron spectrometer of the Reme plasma analyzer-complete positive ion, electron and ram negative ion measurements near comet Halley (RPA-COPERNIC) experiment aboard the Giotto spacecraft, although damaged during the comet Halley encounter in March 1986, has provided very new results during the encounter on July 10, 1992, with the weakly active comet Grigg-Skjellerup (G-S). The main characteristic features of the highly structured interaction region extending from approximately 26,500 km inbound to approximately 37,200 km outbound are presented. These results are compared to the results obtained by the same instrument during the Giotto comet Halley fly-by. Despite the large difference in the size of the interaction regions (approximately 60,000 km for G-S, approximately 2000,000 km for Halley) due to 2 orders of magnitude difference in cometary neutral gas production rate, there are striking similarities in the solar wind interactions with the two comets.

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