On the brightness variations of Comet Halley at large heliocentric distances

Details On the brightness variations of Comet Halley at large heliocentric distances On the brightness variations of Comet Halley at large heliocentric distances

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986em%26p...35..203f&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 35, July 1986, p. 203-212. Research supported by the University of California.

Physics

12

Brightness, Halley'S Comet, Variability, Albedo, Cometary Atmospheres, Electric Potential, Interplanetary Dust, Solar Wind

Scientific paper

Sporadic variations of its intrinsic brightness of up to 500 percent, with time scales as short as a few hours, has been exhibited by Halley's comet at large heliocentric distances (11-8 AU). It is shown that many of these brightness enhancements are closely correlated to the encounter of high-speed solar wind streams by the comet. It is proposed that during such periods, the night side of the comet gets charged to numerically large negative electrostatic potentials, with consequent electrostatic levitation and blow-off of fine charged dust grains lying on it. This gives rise to the observed brightness variations.

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