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Possible Mechanisms for Cometary Outbursts

Published online by Cambridge University Press:  12 April 2016

David W. Hughes
David W. Hughes*
Affiliation:
Department of PhysicsUniversity of SheffieldSheffield, S3 7RH, U.K.

Abstract.

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A cometary outburst is an unexpected flare-up in the brightness of a comet, with the brightness normally increasing by 2 to 3 magnitudes, but on occasion by up to 5. This outburst is superimposed on the general change in brightness that is related to the comet’s heliocentric and geocentric distance, spin phase, spin axis orientation and activity geography. The brightness variation during outbursts usually has an abrupt, eruptive onset followed by a quasi-exponential decrease and lasts for a few tens of days. Several cometary outbursts are accompanied by the expansion of a spherical halo from the brightest point at the centre of the visible cometary coma.

Type
Section IV: The Cometary Nucleus
Information
International Astronomical Union Colloquium , Volume 116 , Issue 2: Comets in the Post-Halley Era , 1991 , pp. 825 - 851
Copyright
Copyright © Kluwer 1991

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