Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..10e..32i&link_type=abstract
Progress in Planetary Exploration Missions, 26th meeting of the IAU, Joint Discussion 10, 21-22 August 2006, Prague, Czech Repub
Physics
Scientific paper
The temperature regime of an active region considered as a conical, cylinder and trench hole in the surface dust layer on a cometary nucleus is calculated. A nucleus of a comet is considered as spherical and homogeneous. The temperature is defined from the geometrical parametrs of the active region separately for CO, CO[2] and H[2]O ice bottom and dust walls. The crater structure is a good concentrator of the solar radiation. The effect of amplification of sublimation from such an active region is considered for different heliocentric distances. The heat conductivity along the dust walls was neglected, because the direct radiation heating from hot dust walls is more effective by a factor ~10^4. Sometimes ice may sublimate even from the night hemisphere due to infrared radiation from dusty side of the crater. The result of calculation shows that even minimal heating of the side-walls of the crater gives the infrared flux onto its bottom that increases the flux of sublimate from the bottom of the crater.
Ivanova V. A.
Shulman L. M.
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