Simultaneous observations of the auroral ovals in both hemispheres under varying conditions

Details Simultaneous observations of the auroral ovals in both hemispheres under varying conditions Simultaneous observations of the auroral ovals in both hemispheres under varying conditions

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3203103s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 3, CiteID L03103

Physics

5

Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetic Reconnection (7526, 7835)

Scientific paper

This is the first analysis to use simultaneous observations of the entire auroral ovals in both hemispheres to track their location. Data was used from the Polar VIS and IMAGE FUV imagers on 23 October 2002 and plotted in AACGM coordinates. Results showed the expected IMF By-dependent asymmetry along the dawn-dusk meridian; however, there was an unexpected offset of both ovals toward dawn. Evidence is also shown for an asymmetry along the noon-midnight meridian dependent on both dipole tilt angle and the sense of IMF Bx. During a brief period of weak IMF Bz > 0 and IMF Bx > 0, the southern oval is observed to move equatorward relative to the northern oval, consistent with tail lobe reconnection occurring only in the southern hemisphere. This has important implications for the global response of the magnetosphere to different interplanetary conditions.

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