Simulations and Observations of Vortices Near Saturn's Dawn Magnetopause

Details Simulations and Observations of Vortices Near Saturn's Dawn Magnetopause Simulations and Observations of Vortices Near Saturn's Dawn Magnetopause

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1654w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1654

Physics

2409 Current Systems (2721), 2463 Plasma Convection (2760), 2753 Numerical Modeling, 5737 Magnetospheres (2756)

Scientific paper

We have used a global magnetohydrodynamic simulation of the interaction of the solar wind with Saturn's magnetosphere and Cassini observations to investigate vorticity in the morning magnetosphere. We find that large vortices form for northward IMF in a region near the morning magnetopause with large velocity shear. The vortices are associated with strong field aligned currents. The vortices do not form in simulations with southward IMF or low velocity shear. For our initial simulations we assumed a source of plasma from the moon Enceladus of 2X1029 AMU/s. This is near the upper limit on the Enceladus plasma source. In this study we will present results from simulations which span the entire range of estimated Enceladus sources. In the simulations the boundary vortices cause magnetic field oscillations in the Kronian magnetosphere. The oscillations have periods of one to three hours. We have examined Cassini magnetic field observations1 in the morning and find similar oscillations. In this talk we will present the results from a statistical study of the observed oscillations and a comparison of their properties with the simulation results. 1 Daugherty, M. K., S. Kellock, A. P. Slootweg, N. Achilles, S. P. Joy and J. N. Mafi, CASSINI MAG CALIBRATED SUMMARY AVERAGED, C-E/SWS/J/S-MAG-4-SUMM-AVERAGED-V1.0, NASA Planetary Data System, 2007.

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