Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51a1177b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51A-1177
Physics
6005 Atmospheres (1060), 6008 Composition (1060), 6025 Interactions With Solar Wind Plasma And Fields, 6050 Plasma And Mhd Instabilities (2149, 2752, 7836)
Scientific paper
Water chemistry is a major source of ions and electrons that further initiate key gas-phase reactions, leading to the plethora of molecules and atoms seen in cometary atmospheres. It is central in understanding the physico-chemical processes of comets. These relevant processes are identified in a model to understand in situ measurements of comet 19P/Borrelly, and to provide valuable insights into the intrinsic properties of cometary nuclei. Details of these processes are presented, from the collision-dominated inner coma to the solar wind interaction region. The results include the temperature and velocity structure and photo- and gas- phase chemistry throughout the cometary atmosphere. The effects of photoelectrons that react via electron impact reactions are important to the overall ionization. This extensive modeling effort to investigate important cometary processes, especially water chemistry, is highly relevant to past, on-going, and future spacecraft missions to comets. We gratefully acknowledge funding from NASA's Discovery Data Analysis Program.
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