Response of Saturn's Magnetosphere and Ionosphere to Solar Wind Driving

Details Response of Saturn's Magnetosphere and Ionosphere to Solar Wind Driving Response of Saturn's Magnetosphere and Ionosphere to Solar Wind Driving

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm33c..04h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM33C-04

Physics

2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 5706 Aurorae, 5737 Magnetospheres (2756), 6275 Saturn

Scientific paper

The extent to which the solar wind drives Saturn's magnetosphere-ionosphere system is an ongoing topic of extensive study due to both the Cassini spacecraft presence in the Saturnian system as well as the recent (2007, 2008) Hubble Space Telescope campaign to image the UV aurora. Studies using these data have shown some evidence that solar wind dynamic pressure enhancements influence the aurora as well as the magnetosphere. In this study, we address the solar wind driving using our 3D global MHD model of Saturn's magnetosphere-ionosphere. In order to study the coupled solar wind-magnetosphere-ionosphere system it is necessary to know the upstream solar wind conditions. We have recently published a detailed validation of our MHD model which propagates the solar wind radially outward from the Earth (ACE) to Saturn [Zieger and Hansen, JGR, 2008]. These solar wind values can be used as input to our global, 3D, MHD model of the magnetosphere. From the global model we extract time series that can be compared directly to spacecraft data. These include the total auroral power as well as the locations of both the auroral oval and the open- closed field lines boundary. In addition, we are able to explore the global structure of the magnetosphere including auroral morphology and current structures that create the aurora as well as convection patterns in the magnetosphere. Results will be presented from the two time periods of extensive HST measurements

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