Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..269h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 269-272. Research supported by DFG.
Physics
18
Chemical Composition, Comets, Ice, Interplanetary Dust, Sublimation, Carbon Dioxide, Coma, Space Environment Simulation, Water
Scientific paper
Measurements of gas fluxes from insolated ice/dust mixtures were performed using pressure gauges and a mass spectrometer placed one meter in front of the sample. The measurements were carried out in the framework of the KOSI program. As soon as the insolation of about one solar constant was started, a fast rise in H2O and CO2 emissions from the fresh surface was detected, followed by a slow decrease of the gas fluxes. When intermittent dark periods occurred, water emission dropped rapidly while CO2 fluxes were measured for hours. Results from labeled isotope layers gave data on sublimation depth and temperature and indicated that sublimated CO2 migrated also toward deeper parts of the sample where it recondensed, producing an enrichment. A simple model is proposed which describes the redistribution of CO2 within the sample consistent with the gas phase and solid phase measurements of CO2 abundances. The present study is of interest in connection with Whipple's theory that comets are composed of ice and dust.
Hesselbarth P.
Krankowsky Dieter
Laemmerzahl P.
Mauersberger Konrad
Winkler Andrea
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