Dayside Auroral Morphology During Southeast IMF Orientation:Spatial Structure and its Implications for Magnetopause Reconnection

Details Dayside Auroral Morphology During Southeast IMF Orientation:Spatial Structure and its Implications for Magnetopause Reconnection Dayside Auroral Morphology During Southeast IMF Orientation:Spatial Structure and its Implications for Magnetopause Reconnection

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm12a1191s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM12A-1191

Physics

2407 Auroral Ionosphere (2704), 2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

In a case study we elaborate on the spatial structure of the dayside aurora within 0800-1600 MLT and discuss its implications for magnetopause reconnection topology. The detailed 2D auroral morphology is obtained from continuous ground observations at Ny Ålesund (76o MLAT), Svalbard during days when the interplanetary magnetic field (IMF) was oriented in the southeast direction (By > 0; Bz < 0). The major auroral features consist of sequential activations of latitudinally separated, sunward moving, arcs/bands (dayside BPS precipitation) in the prenoon (0800-1100 MLT) and postnoon (1200-1600 MLT) sectors which are separated by a deep minimum in activity/intensity within the 1100-1200 MLT sector. The latter ``midday gap'' aurora is attributed to the presence of component, steady state reconnection at the subsolar magnetopause where the stagnant magnetosheath flows lead to field-aligned currents (FAC) which are of only moderate intensity. The much more active and intense aurorae in the prenoon (0800-1100 MLT) and postnoon (1200-1600 MLT) sectors originate in magnetopause reconnection events that are initiated well away from the subsolar point, presumably in the form of antiparallel merging taking place near-simultaneously at high magnetopause latitudes in the southern/prenoon and northern/postnoon hemispheres, respectively, where the stronger boundary layer flow shears give rise to more intense FACs and aurorae.

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