Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..595t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 595-598.
Physics
13
Auroras, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Configurations, Polar Caps, Solar Terrestrial Interactions, Earth Magnetosphere, Magnetopause, Solar Wind
Scientific paper
A magnetic configuration of the open magnetosphere is described which is conducive to the formation of the theta aurora when the IMF has a significant northward component. A magnetic field topology and polar cap configuration, derived from a quantitative model of the open magnetosphere that incorporates Crooker's antiparallel merging hypothesis, are presented. Under this hypothesis, when the IMF has a northward component, the dayside merging line bifurcates, leaving a large fraction of the subsolar magnetopause untouched by the merging process. The polar cap, defined by tracing magnetic field lines that connect from the solar wind to the earth, is similarly bifurcated, leaving a sun-aligned stagnation region that is not magnetically connected to the solar wind and may plausibly be associated with the sun-aligned 'bar' of the theta aurora. The model provides testable predictions with regard to the position of this 'convection gap' in both Northern and Southern Hemispheres as functions of IMF direction.
Hill Thomas W.
Toffoletto Frank R.
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