Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..190g&link_type=abstract
(Modelling, simulation and sounding of cometary nuclei; Proceedings of the International Workshop, Cagliari, Italy, May 28-30, 1
Astronomy and Astrophysics
Astrophysics
6
Astrophysics, Comet Nuclei, Space Environment Simulation, Astronomical Models, Cosmic Dust, Space Missions, Sublimation, Thermal Emission
Scientific paper
An overview of laboratory experiments on cometary processes conducted by the Kometen-simulation (KOSI) project in the DLR space simulation chamber is presented. Past experiments dealt with the energy balance of insolated ice-dust mixture, structural and compositional modifications of the sample, and emission of gases, ice, and dust particles. Two dedicated KOSI experiments were conducted in late 1991. One experiment addressed the heat transport within, the sublimation of, and the gas emission from a pure porous water ice sample during irradiation. The second experiment studied the formation and destruction of a dust mantle on top of an ice-dust mixture at varying insolation intensities. Experiments slated for the future include: the dependence of the gas and dust emission on surface topography (i.e., slopes, craters, and crevices); the study of microscopic dust release mechanisms and subsequent gas-dust interactions; and an investigation of the effects of chemically active materials (activated by UV radiation or high-energy particles) on the sample surface.
Benkhoff Johannes
Gebhard Juergen
Gruen Eberhard
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