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Release and fragmentation of aggregates to produce heterogeneous, lumpy coma streams

Clark, B.C.; Green, S. F.; Economou, T.E.; Sandford, S.A.; Zolensky, M.E. and Brownlee, D.E. (2004). Release and fragmentation of aggregates to produce heterogeneous, lumpy coma streams. Journal of Geophysical Research: Planets, 109(E12) E12S03.

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The unpredicted heterogeneity in particle number density in the coma of Wild 2 is consistent with delayed fragmentation to produce small particles from larger aggregates initially ejected from the cometary nucleus. The resultant heterogeneous inner coma results in stochastic variations in particle number and size distribution. Fragmentation can be accelerated after aggregate release by enhanced heating and one or more additional factors such as abrupt depressurization, phase transitions, exothermic chemical reactions, centrifugal forces, and electrostatic repulsion. Certain predicted characteristics of such in-flight disaggregation in coma particle streams correspond to known cometary phenomena.

Item Type: Journal Article
Copyright Holders: 2004 by the American Geophysical Union
ISSN: 2156-2202
Keywords: cometary ice analogs; dust coma; Hale-Bopp; detector measurements; interstellar dust; grigg-skjellerup; p/arend-rigaux; inner coma; c/1996 b2; p/wild 2
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6746
Depositing User: Astrid Peterkin
Date Deposited: 08 Feb 2007
Last Modified: 14 Jan 2016 16:27
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