Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1642l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1642
Physics
2704 Auroral Phenomena (2407), 2723 Magnetic Reconnection (7526, 7835), 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms
Scientific paper
Simultaneous UV images of the conjugate aurora, taken from the IMAGE and Polar spacecraft reveal prominent differences between the two hemispheres. During a period of 1.5 hours of continuous measurements, we observe: 1) An intense arc in the dusk sector which extends further towards midnight in the southern hemisphere than in the northern hemisphere, 2) A much more severe poleward expansion in the southern hemisphere during a substorm growth phase, and 3) An asymmetric intensity distribution, with the most intense aurora at dusk in the southern hemisphere, and at dawn in the northern hemisphere. Throughout this period, the IMF was stable, with Bz negative (≈-4 nT), By slowly increasing from ≈-2 to ≍ 2 nT, and Bx positive (≍ 10 nT). Previous studies suggest that penetration of positive IMF Bx into the magnetosphere may explain at least part of the observations presented here.
Laundal K.
Ostgaard Nikolai
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