The Plasma Environment of Comet 19P/Borrelly During the Deep Space 1 Encounter

Details The Plasma Environment of Comet 19P/Borrelly During the Deep Space 1 Encounter The Plasma Environment of Comet 19P/Borrelly During the Deep Space 1 Encounter

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p13a1639b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P13A-1639

Physics

[6005] Planetary Sciences: Comets And Small Bodies / Atmospheres, [6025] Planetary Sciences: Comets And Small Bodies / Interactions With Solar Wind Plasma And Fields, [6026] Planetary Sciences: Comets And Small Bodies / Ionospheres

Scientific paper

Water chemistry is central to understand the physics and chemistry of comets. It is the major source of ions and electrons via photochemistry that further initiate key gas-phase and electron impact reactions, leading to the plethora of radicals, molecules, and atoms seen in cometary comae. In this paper, relevant physico-chemical processes in the coma of comet 19P/Borrelly have been identified within a modeling framework to understand in situ measurements from the ion mass spectrometer (PEPE) aboard the Deep Space 1 (DS1) spacecraft. Details of these processes have been improved relative to our previous models, from the collision-dominated inner coma to the solar wind interaction region. We propose a new mechanism to explain observed asymmetries in the plasma comae of comets. We are continuing this work with further modeling to advance the idea that fluctuations in the solar wind during a spacecraft encounter is the major effect influencing the asymmetry of the plasma coma. This has great implications to on-going comet missions (e.g., Rosetta, ESA) and planned comet missions (e.g., Comet Surface Sample Return, NASA), as well as understanding the results from past missions.

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