Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4171k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4171-4177.
Physics
77
Auroral Arcs, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Polar Caps, Convection, Dynamo Theory, Space Plasmas
Scientific paper
A theory of the polar cap auroral arcs is proposed under the assumption that the magnetic field reconnection occurs in the cusp region on tail field lines during northward interplanetary magnetic field (IMF) conditions. Requirements of a convection model during northward IMF are enumerated based on observations and fundamental theoretical considerations. The theta aurora can be expected to occur on the closed field lines convecting sunward in the central polar cap, while the less intense regular polar cap arcs can occur either on closed or open field lines. The dynamo region for the polar cap arcs is required to be on closed field lines convecting tailward in the plasma sheet which is magnetically connected to the sunward convection in the central polar cap.
Burke William J.
Kan Joseph R.
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