A Multi-species Chemistry Approach of Io's Local Interaction

Details A Multi-species Chemistry Approach of Io's Local Interaction A Multi-species Chemistry Approach of Io's Local Interaction

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm23a0298d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM23A-0298

Physics

2732 Magnetosphere Interactions With Satellites And Rings, 2756 Planetary Magnetospheres (5443, 5737, 6033), 6219 Io, 6220 Jupiter

Scientific paper

The interaction between Io's atmosphere and the plasma torus is a source of energy and momentum, a supply of fresh plasma to the Jovian magnetosphere and a cause of auroral and radio emissions in Jupiter's atmosphere. Previously, this interaction has been extensively studied focusing on the electrodynamics in a single- species description. Our approach focuses on the multi-species chemistry as the plasma in the torus impinges on Io's atomic and molecular neutral atmosphere. We have adapted our physical chemistry model of the Io plasma torus (Delamere and Bagenal, JGR, 2003) to investigate the time evolution of mass and energy for a homogenous volume (i.e. flux tube) for an ensemble of plasma streamlines by Io. We seek to answer three basic questions: (1) Which neutral species play dominant roles in the multi-species chemistry? (2) Which are the dominant chemical reactions? (3) Where do plasma production and mass loading take place? The model simplifies the electrodynamics of the Io interaction to the analytical description of the plasma flow around a conducting sphere (Io) from Barnett, JGR 1986. Our goal is to explore the sensitivity of the plasma production and mass loading rates to parameters of the model (inflowing plasma conditions, neutral cloud composition and distribution) which we compare with the Galileo flyby data. We emphasize the dominant role of SO2 in the multi-species chemistry, the dominant role of the SO2+/SO2 charge exchange (Johnson, priv. comm.) and map the regions of mass loading and pick up current. The model suggests that most of the plasma provided to the torus comes from the extended neutral clouds and very little from the local interaction.

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