Substorm auroral asymmetries in the conjugate hemispheres during onset and expansion phase

Details Substorm auroral asymmetries in the conjugate hemispheres during onset and expansion phase Substorm auroral asymmetries in the conjugate hemispheres during onset and expansion phase

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm24a..08o&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM24A-08

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

Simultaneous global imaging in the ultraviolet wavelengths by the IMAGE and Polar satellites are used to examine the dynamics of the auroral substorm. When mapped onto apex coordinates, the auroral features in the conjugate hemispheres are usually found to be asymmetric. Earlier studies have demonstrated that substorm onset locations in the two hemispheres are displaced due to the orientation of the interplanetary magnetic field. The systematic asymmetry of substorm onset locations in the two hemsipheres controlled by IMF clock angle has also been confirmed statistically. In this paper we follow similar features in the two hemispheres during expansion phase of several substorms. We find that the asymmetry induced by the IMF clock angle at substorm onset seem to disappear during the expansion phase. Various mechanism that can re-establish the symmetric aurora are discussed.

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