Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.6981r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 6981-6993. Research supported by the Natural Scienc
Physics
104
Interplanetary Magnetic Fields, Magnetic Disturbances, Magnetospheric Instability, Polar Substorms, Geomagnetism, Magnetic Signatures, Particle Precipitation, Resistance Heating, Solar Wind Velocity
Scientific paper
Evidence has been adduced over the last decade which suggests that the northward turnings of the IMF after a sustained southward IMF interval can trigger the onset of major substorm expansive phase effects. Three examples of isolated substorms which establish the validity of this triggering effect are presented. It is in these three cases clear that the substorm current wedge triggered by the northward turning of the IMF carries substantially larger currents than the driven system which is associated with the overall substorm event. A discussion is undertaken of the IMF's role in the external triggering of Joule heating and particle precipitation episodes within the substorm process.
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