The morphology of dayside Birkeland currents

Details The morphology of dayside Birkeland currents The morphology of dayside Birkeland currents

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..457s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 457-461.

Physics

16

Birkeland Currents, Field Aligned Currents, Interplanetary Magnetic Fields, Magnetosphere-Ionosphere Coupling, Dynamics Explorer 2 Satellite, Geomagnetism, Magnetopause, Solar Wind

Scientific paper

A simple model bringing theoretical order to the many patterns proposed previously for the morphology of dayside Birkeland currents as observed by orbiting satellites in the topside polar ionosphere is presented. Specifically it is shown that the cusp Birkeland current system is not a latitudinally separate region but is instead the extension in longitude of the region 1 Birkeland current from either dawn or dusk; which particular one depends on the sign of tht east-west (Y) component of the IMF. The presence of an IMF Y-component therefore leads to two region-1 current systems near magnetic noon, with the poleward one being that previously called the 'cusp' system.

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