Day-side Aspects of Theta-aurora

Details Day-side Aspects of Theta-aurora Day-side Aspects of Theta-aurora

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13b1219v&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13B-1219

Physics

2407 Auroral Ionosphere (2704), 2724 Magnetopause, Cusp, And Boundary Layers, 2740 Magnetospheric Configuration And Dynamics, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Global MHD-modeling has been used to study the magnetospheric effect of IMF changes typically observed in connection with the occurrence of theta-aurora. We find that the observed geometry of the polar cap, to a large extent, can be explained by the changing merging scenario at the dayside. During intervals of almost northward IMF the solar wind flux-tubes reconnect in both hemispheres, thereby converting open lobe field-lines to closed "double reconnected" day-side field-lines. Thus a predominantly northward IMF is associated with a closing up of the magnetosphere from the dayside. The closure occurs preferentially at either the dawn or the dusk-side depending on the sign of IMF By. Subsequent directional changes of the IMF invokes growth of a new polar cap at either the dusk- or the dawn-side depending on the sign of By and Bz.

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