Radiation emitted during the flight of asteroids and comets through the atmosphere

Details Radiation emitted during the flight of asteroids and comets through the atmosphere Radiation emitted during the flight of asteroids and comets through the atmosphere

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..491n&link_type=abstract

Planetary and Space Science, vol. 42, no. 6, p. 491-506

Computer Science

20

Asteroids, Atmospheric Models, Atmospheric Radiation, Cometary Collisions, Comets, Environment Effects, Kinetics, Molecular Dynamics, Planetary Atmospheres, Radiation Effects, Shock Waves, Atmospheric Composition, Computerized Simulation, Fires, Flow Distribution, Heat Transfer, Temperature Distribution

Scientific paper

The radiation emitted during the flight of a cosmic body through the atmosphere is an important factor in the body's interaction with a planet. A variety of radiation aspects are considered in this paper. Altitudes of interest here range from the dense atmosphere to above 100 km where nonequilibrium and non-stationary ionic kinetic and molecular dynamics play an important role. Structure, intensity and the spectrum of radiative shock waves generated in the atmospheres of the Earth and Mars are investigated on the basis of the detailed numerical simulations. Ignition of fires, creation of a thin thermal layer at the ground, which essentially changes flow pattern after the impact, and contamination of the atmosphere by soot, aerosols and dust may pose a threat to humanity. These problems are also considered. Registered radiation of 1-10 m bodies can supply the necessary data on their properties and refine size-frequency curves. A relatively simple method to obtain the body characteristics in flight is developed and some observational data are analyzed. In the proposed scenario the body is heavily fragmented and intensely radiates due to an increase of its effective area.

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