Physics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981esasp.174...77s&link_type=abstract
In ESA The Comet Halley Dust and Gas Environ. p 77-84 (SEE N82-23095 13-91)
Physics
7
Comet Tails, Dynamic Characteristics, Granular Materials, Halley'S Comet, Halos, Ice Nuclei, Optical Properties, Flyby Missions, Gravitational Effects, Interplanetary Dust, Radiation Pressure, Scattering Functions, Temperature Distribution
Scientific paper
The existence of an ice halo in the tail of Halley's comet during the Giotto flyby is studied. The optical properties of coated and irregular shaped particles are reviewed in order to derive a zero order approximation of a scattering function for cometary dust particles. The ratio of the radiation pressure exerted on grains to solar gravitational attraction is discussed for low density and ice coated particles. Based on these values and the derived temperature distribution of the dust particles, results on the dynamics of evaporating ice grains in the coma of comet Halley for the encounter geometry are presented. The maximum extent of an ice halo consisting of pure ice is 1 million km.
Kneissel Bernhard
Schwehm Gerhard H.
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