Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.332...51t&link_type=abstract
Nature (ISSN 0028-0836), vol. 332, March 3, 1988, p. 51, 52. BMFT-NASA-supported research.
Physics
18
Cometary Atmospheres, Cosmic Dust, Halley'S Comet, Comet Nuclei, Particle Flux Density, Comets, Halley, Intensity, Dust, Source, Spacecraft Observations, Structure, Particles, Density, Distance, Comet Nuclei, Models, Surface, Hmc Instrument, Diagrams, Emissions, Topography
Scientific paper
Images obtained by the cameras on board the spacecraft encountering comet Halley in March 1986 showed that the dust activity was very non-uniform. The dust particle density at large distances (R > 100 km) from the nucleus decreases proportional to 1/R2, that is, the intensity decreases proportional to 1/R as expected for free outflow. Flattening of the profile is evident within several tens of kilometres of the nucleus. This can be explained by a model that considers the extended size and non-uniformity of the active region on the surface. A critical scale length, defined by the opening angle of a jet-like feature and the size of the source, can be introduced to describe the flattening. The model is consistent with the observations.
Boice Daniel C.
Huebner Walter F.
Thomas Nicholas
Uwe Keller Horst
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