Statistics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm31b0461p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM31B-0461
Statistics
2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Statistical analysis of sawtooth events and steady magnetospheric convection (SMC) periods show that the solar wind speed is much higher during sawtooth events than it is during SMC periods even for a set of cases with similar driving solar wind electric field values. Thus, high solar wind speed seems to induce periodic activity while low speed and larger IMF tend to produce a steadily convecting, rather stable magnetosphere. Further statistics of all activity conditions shows that during southward IMF, for the same solar wind electric field value larger speed and smaller Bz magnitude drive higher activity than smaller speed and larger Bz magnitude. These results are confirmed by results from three LFM global MHD simulation runs, which show that originally stable magnetosphere remains stable if IMF Bz magnitude is increased, while stronger activity and localized flows appear if the solar wind speed is increased. All these results point out the key role of the solar wind speed in determining the global state of the magnetosphere.
Goodrich Charles Carson
McPherron Robert L.
Palmroth M. M.
Partamies N.
Pulkkinen Tuija I.
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