A Giotto/cometary interaction event near the diamagnetic cavity boundary

Details A Giotto/cometary interaction event near the diamagnetic cavity boundary A Giotto/cometary interaction event near the diamagnetic cavity boundary

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917691i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,691-17,694

Physics

1

Diamagnetism, Giotto Mission, Halley'S Comet, Interplanetary Dust, Ionopause, Ions, Mathematical Models, Energy Spectra, Magnetic Fields, Mass Spectroscopy, Shock Waves, Space Plasmas, Wave Propagation

Scientific paper

A new scenario is suggested in order to explain the burst of particles observed by Giotto near the Halley ionopause. According to this scenario, an impact of a cometary dust particle against the Giotto spacecraft (identified by Neubauer et al. (1990)) creates a gas/plasma cloud. Cold cometary ions with a velocity of 70 km/s that impinge on the cloud around the spacecraft are scattered by the secondary ions/neutral species in the cloud. this scattering is shown to allow the cometary ions to enter the angular detectors. This mechanism casts some doubt on alternative explanations of the observed phenomenon and thereby may call into question the very existence of suprathermal particles near the Halley ionopause.

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