A note on the very small grains (VSGs) observed at Halley's comet

Details A note on the very small grains (VSGs) observed at Halley's comet A note on the very small grains (VSGs) observed at Halley's comet

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.189..327f&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 189, no. 2, March 1992, p. 327-331.

Astronomy and Astrophysics

Astrophysics

11

Cosmic Dust, Halley'S Comet, Solar Wind, Spacecraft Trajectories, Spatial Distribution, Vega Project

Scientific paper

The most striking feature in the spatial distribution of the smallest dust grains observed at Halley's comet by the VEGA-1 spacecraft is the sharp glitch at a cometocentric distance of about 180,000 km, which approximately corresponds to the cometopause inside which the contaminated solar-wind plasma was rapidly cooled. This glitch is theorized to have been caused by the electrostatic disruption of larger composite grains which rapidly charged up as they traversed the cometopause. The clear asymmetry in the distribution between the inbound and outbound portion of the spacecraft trajectory is also consistent with the dynamical effects of grain charging.

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