Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.174...55s&link_type=abstract
In ESA The Comet Halley Dust and Gas Environ. p 55-65 (SEE N82-23095 13-91)
Physics
4
Comet Tails, Halley'S Comet, Interplanetary Dust, Particle Flux Density, Particle Production, Luminous Intensity, Particle Acceleration, Particle Size Distribution, Solar Radiation
Scientific paper
Observations of the dust tail of Comet Halley about the time of the Earth's transit across the orbit plane of the comet are analyzed. The Earth grazed the tail, whose apparent length reached up to 150 deg. The maximum acceleration the ejecta were subjected to by solar radiation pressure is approximately 2.5 times the solar attraction. This acceleration indicates the presence of submicron sized, strongly absorbing particles. Their detectable contribution to the tail's brightness is limited to the immediate proximity of the orbit plane because of a low reflectivity and/or a low spatial density. The width of the tail, observed edgewise at the time of transit, is determined by particles whose beta = 05, possibly submicron sized dielectric grains. Their derived ejection velocity = 450 m/sec.
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