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A Model of an Active Region on the Surface of a Cometary Nucleus
Authors:Ivanova  Aleksandra  Shulman  Leonid
Institution:(1) Main Astronomical Observatory of the National Academy of Sciences of Ukraine, 27 Akad. Zabolotny Str., 03680 Kyiv, Ukraine
Abstract:An active region on the surface of a cometarynucleus is considered as a conic hole in the surface dust mantle with icy bottom and dusty side-walls. This conic structureshould concentrate solar energy onto the bottom andtherefore enhance sublimation. Preliminary results of thecalculation of this effect are given. The temperature distributionat the bottom of the crater is calculated for different sets ofits geometrical parameters. Effects of intensified sublimation depending on the geometrical parameters areconsidered for the specific case when a single active region islocated exactly at the pole of the nucleus and the pole is directed tothe Sun.
Keywords:Active region  cometary nucleus  craters  sublimation rate
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