Ionospheric Convection and Reconnection Signatures in a Global Circulation Model of the Earth Magnetosphere for Northward IMF and for IMF By

Details Ionospheric Convection and Reconnection Signatures in a Global Circulation Model of the Earth Magnetosphere for Northward IMF and for IMF By Ionospheric Convection and Reconnection Signatures in a Global Circulation Model of the Earth Magnetosphere for Northward IMF and for IMF By

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1432k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1432

Physics

2723 Magnetic Reconnection (7526, 7835), 2736 Magnetosphere/Ionosphere Interactions (2431), 7827 Kinetic And Mhd Theory, 7833 Mathematical And Numerical Techniques (0500, 3200)

Scientific paper

We use a global MHD model of the Earth magnetosphere to study convection in the Earth ionosphere. This convection is ultimately driven by the magnetic reconnection processes. We find that the magnetic field topology in our model is consistent with the classical null-separator model of Dungey and Cowley, and with anti-parallel reconnection scenario. We identify observable ionospheric convection patterns, predicted by our model, which include so- called lobe convection cells, circulating entirely inside the polar cap in the summer hemisphere, and reciprocal cells, circulating entirely in the closed field line region in the winter hemisphere. We show examples of events (July 11, 2000 and December 4, 2000) when such patterns were, in fact, observed with SuperDARN radars and DMSP satellites. We also present initial results of a similar modeling study for pure IMF By case, which are also consistent with the null-separator model.

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