Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250b.167g&link_type=abstract
In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus p 167-171 (SEE N
Astronomy and Astrophysics
Astronomy
13
Astronomical Models, Cosmic Dust, Halley'S Comet, Heuristic Methods, Mathematical Models, Particle Size Distribution, Comet Nuclei, Giotto Mission, Ice, Vega Project
Scientific paper
A differential dust production rate distribution at the surface of comet Halley is proposed. The integral of this function over all dust sizes yields a divergent result, consequently the cutoff size (the size of the largest particles capable of leaving the surface of the nucleus) determines the normalization factor of the entire distribution function to a very large extent. A factor of 10 change in the cutoff size can result in a variation of several orders of magnitude of the number of submicron size dust particles. It is suggested that a localized disruption (crack) developed in the evacuated surface dust mantle shortly before the arrival of Vega 1. Dust particles freshly released from this newly uncovered ice are thought to have a higher friability parameter value than from a well developed mantle, consequently one expects a decrease of the cutoff size during a mantle disruption event. By the time of the Giotto encounter a new mantle had evolved thus decreasing the friability. This decreasing friability resulted in a higher cutoff size and in a dramatic decrease of the number of submicron size particles.
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