Computer Science – Sound
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rpspr...6...86b&link_type=abstract
In its USSR Report: Space (JPRS-USP-86-001) p 86 (SEE N86-20178 10-88) Transl. into ENGLISH from Pisma v Astronomicheskiy Zhu
Computer Science
Sound
Comet Heads, Halos, Hydrodynamics, Ice, Temperature, Cooling, Gas Flow, Mathematical Models, Particles, Photodissociation, Supersonic Flow, Water
Scientific paper
A study was made of the influence of an ice halo on the temperature of the inner coma of a comet for a comet of average brightness situated at a heliocentric distance 1 a.u. It is shown that the presence of a halo can greatly smooth the temperature minimum, increasing the minimum temperature by several times. A hydrodynamic model of the inner coma was computed with the following assumptions: There is a stationary spherically symmetric flow of gas and ice particles; the cometary nucleus, gas and ice particles consist only of H2O; the ice particles are accelerated by the gas, but the gas does not experience significant slowing in the process; at the nucleus surface the gas velocity is equal to the speed of sound so that the entire gas flow is supersonic; the gas is heated due to photodissociation of molecules by an unattenuated flux of solar radiation and as a result of the entry into it of thermal molecules evaporating from the surface of ice particles; the gas is cooled only due to expansion; the surface temperature of the nucleus and ice particles is determined by the balance between the processes of absorption of solar radiation, evaporation and thermal radiation and is stipulated as a constant parameter; the ice particles are spheres of an identical radius with an identical evaporation rate over the entire surface. It is demonstrated that cooling in the inner coma can be considered negligible at distances up to approximately 1,000 km from the nucleus.
Bisikalo Dimitry V.
Strelnitskiy V. S.
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