Formation of vortices on the Kronian magnetosphere with the high temporal and spatial resolution for MHD simulation

Details Formation of vortices on the Kronian magnetosphere with the high temporal and spatial resolution for MHD simulation Formation of vortices on the Kronian magnetosphere with the high temporal and spatial resolution for MHD simulation

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm23a1937f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM23A-1937

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[0545] Computational Geophysics / Modeling, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2756] Magnetospheric Physics / Planetary Magnetospheres, [6275] Planetary Sciences: Solar System Objects / Saturn

Scientific paper

In a series of studies we have reported vortices at the dawn magnetopause at Saturn in simulations when IMF was northward which we interpreted at resulting from the Kelvin Helmholtz (K-H) instability [Fukazawa et al., 2007; Walker et al., 2010]. Studies of the K-H waves using quasi-local simulations at the Earth have shown that the formation of the vortices can be highly dependent on the grid spacing used in the simulations [Matsumoto and Seki, 2010] In particular there can be secondary variations in the vortex structure. However these simulations did not include the magnetic curvature which affects the occurrence of KH instability because they do not treat the global configuration. On the other hand, it has been hard to simulate the global magnetosphere with a sufficiently small grid interval to investigate these effects on the global configuration. Recently thanks to the developments of computer and numerical calculation techniques, we have been able perform the global magnetospheric simulations of the magnetosphere with relatively small grid spacing. As the results of this simulation of Kronian magnetosphere, we found that the formation process and configuration of vortex were different from the previous low resolution simulations. In particular, the growth rate of KH wave seems to be high and waves is appeared around dusk side clearly. In this study we will show the results of high resolution global simulation of the Kronian magnetosphere, analysis of the vortices, changes in the configuration of magnetic field lines related to the vortices and their effects on aurora at Saturn.

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