Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3803101o&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 3, CiteID L03101
Physics
Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Substorms
Scientific paper
Five hours of simultaneous global imaging data from the conjugate hemispheres are used to examine the dynamics of the auroral substorm. Earlier studies have demonstrated that substorm onset locations in the two hemispheres are systematically displaced due to the orientation of the interplanetary magnetic field. In this paper we present, for the first time, how the asymmetric auroras induced by the IMF orientation at substorm onset disappears during the expansion phase. We suggest that this is the large scale manifestation of auroral arcs as being the sites of magnetic stress release. Magnetic stress on field lines with asymmetric footpoints can lead to a net hemispherical difference in parallel electric field strength which implies that the auroras move with different speeds in the two hemispheres to release the magnetic stress. The relative velocity can be derived from the potential between the hemispheres. During expansion phase the twisted magnetic fields are rectified, bringing the closed magnetic field lines back to the configuration defined by the Earth's interior.
Humberset B. K.
Laundal K. M.
Østgaard Nikolai
No associations
LandOfFree
Evolution of auroral asymmetries in the conjugate hemispheres during two substorms does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evolution of auroral asymmetries in the conjugate hemispheres during two substorms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of auroral asymmetries in the conjugate hemispheres during two substorms will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1120112