Other
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.3339e&link_type=abstract
Journal of Geophysical Research, vol. 84, July 1, 1979, p. 3339-3359.
Other
11
Antarctic Regions, Auroral Electrojets, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Storms, Cusps (Landforms), Electron Precipitation, Magnetic Signatures, Magnetopause, Photographs, Proton Precipitation, Solar Wind
Scientific paper
Photometric keograms from South Pole Station are used to investigate dayside auroral precipitation. The identification of cusp auroral signatures allows cusp movements to be monitored and correlated with substorm activity and interplanetary magnetic field direction. It is concluded that any erosion of the dayside field is not a direct result of a southward-turning z-component of the interplanetary magnetic field. On the other hand, cusp position is intimately related to substorm timing and intensity. It is suggested that the associated dayside field reconfiguration results from diversion of near-tail magnetopause currents through the nightside electrojet because of enhanced auroral ionosphere conductivity. This interpretation implies that substorms result from increased efficiency of the extraction of energy from the solar wind rather than from a release of internally stored magnetic energy in the tail.
Eather Robert H.
Mende Stephen B.
Weber Edmund J.
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