There is no 'cometopause' at comet Halley

Details There is no 'cometopause' at comet Halley There is no 'cometopause' at comet Halley

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.2301r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A2, p. 2301-2308

Physics

7

Boundary Layer Plasmas, Cometary Atmospheres, Halley'S Comet, Ion Density (Concentration), Solar Wind, Plasma Diagnostics, Plasma Interactions, Plasma Waves, Comets, Halley, Cometopause, Boundaries, Solar Wind, Interaction, Ions, Spacecraft Observations, Giotto Mission, Analysis, Rpa Instrument, Flux, Vega 2 Mission, Comparison, Plasma, Magnetic Field, Comet Nuclei, Distance

Scientific paper

Immediately after the flybys at comet Halley by a fleet of spacecraft in 1986, Gringauz et al. (1986a) reported the detection by the Vega-2 spacecraft of a chemical and sharp plasma boundary, which they named the 'cometopause,' at a distance of about 1.6 x 105 km from the nucleus. Gringauz and Verigin (1991) presented the 'cometopause' as a permanent feature of the solar wind - Halley type comet interaction at about 1 UA from the Sun. This permanent boundary presumably separates an upstream region dominated by the solar wind from the downstream region where heavy cometary ions dominate. We present here the analysis of the results of the Giotto positive ion cluster composition analyzer - Reme plasma analyzer (PICCA-RPA2) ion mass spectrometer and electron electrostatic analyzer - Reme plasma analyzer (EESA-RPA1) electron spectrometer data, which clearly show that there is no such boundary at comet Halley.

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