Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh33c..06s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH33C-06
Other
2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Over the last five years has emerged an awareness that the magnetosphere under extreme solar wind driving conditions is not merely a more energetic version of the magnetosphere under normal conditions. Instead it is a qualitatively different kind of magnetosphere. This awareness emerged largely through the studies using global MHD simulations, which allow one to vary solar wind driving conditions systematically into regimes that the real magnetosphere experiences only rarely and, so, for which observations are incomplete. They also allow one to image the whole magnetosphere in whatever parameter one chooses, for example, electrical current, which turns out to be important in differentiating the normal magnetosphere from the unusual form into which it morphs under extreme driving. In terms of magnetospheric current systems, the normal and extreme conditions of solar wind-magnetosphere coupling are characterized by dominance of the Chapman-Ferraro current in the normal case and dominance of the region 1 current system in the extreme case. The difference has a major effect on the quantitative relationship between the interplanetary electric field, which is used as a measure of the strength of solar wind magnetosphere coupling, and the strength of the electrical currents that actually carry out the coupling (an effect called transpolar potential saturation). Another consequence of the difference is that in the normal case the solar wind interacts mainly with the geomagnetic dipole but it interacts mainly with the ionosphere/thermosphere system in the extreme case. This talk will review the unusual properties of the extreme magnetosphere that have so far been deduced.
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