Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1668w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1668
Other
2721 Field-Aligned Currents And Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
The sudden compression of the magnetosphere in response to a sharp increase in the solar wind dynamic pressure typically produces a world-wide enhancement of the northward ground magnetic field at low latitudes, with a slightly larger enhancement on the day side. A few events produce "atypical" signatures where the low-latitude field enhancements are asymmetric, with the largest field enhancement seen on the night side and little or no field increase near local noon. In most cases the atypical response has been seen in conjunction with a simultaneous Northward turning of the IMF, and has been explained by a transition current system that develops in the high-latitude magnetosphere. However, in at least one atypical instance the IMF has remained Southward but smoothly increasing, and an additional theory involving polar electrojets had been proposed to explain this response. Previously these compression events had been studied by mapping contours of the magnetic variation, with Universal Time on one axis and Magnetic Local Time on the other. In order to validate the models of typical or atypical magnetospheric response to sudden compressions, there is a need to observe the response at all latitudes. We will present the results of constructing maps of the geomagnetic variations from equator to pole, at sequential time steps during the course of both typical and atypical compression events.
Clauer Robert C.
Hockersmith L.
Weimer Daniel R.
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