Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
Ann. Geophys., 30, 325-341, 2012
https://doi.org/10.5194/angeo-30-325-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
08 Feb 2012
3-D mesoscale MHD simulations of magnetospheric cusp-like configurations: cusp diamagnetic cavities and boundary structure
E. Adamson1,*, A. Otto1, and K. Nykyri2 1Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA
2Embry-Riddle Aeronautical University, Daytona-Beach, FL, USA
*now at: Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany
Abstract. We present results from mesoscale simulations of the magnetospheric cusp region for both strongly northward and strongly southward interplanetary magnetic field (IMF). Simulation results indicate an extended region of depressed magnetic field and strongly enhanced plasma β which exhibits a strong dependence on IMF orientation. These structures correspond to the Cusp Diamagnetic Cavities (CDC's). The typical features of these CDC's are generally well reproduced by the simulation. The inner boundaries between the CDC and the magnetosphere are gradual transitions which form a clear funnel shape, regardless of IMF orientation. The outer CDC/magnetosheath boundary exhibits a clear indentation in both the x-z and y-z planes for southward IMF, while it is only indented in the x-z plane for northward, with a convex geometry in the y-z plane. The outer boundary represents an Alfvénic transition, mostly consistent with a slow-shock, indicating that reconnection plays an important role in structuring the high-altitude cusp region.

Citation: Adamson, E., Otto, A., and Nykyri, K.: 3-D mesoscale MHD simulations of magnetospheric cusp-like configurations: cusp diamagnetic cavities and boundary structure, Ann. Geophys., 30, 325-341, https://doi.org/10.5194/angeo-30-325-2012, 2012.
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