Ring coupling model - Implications for the ground state of the magnetosphere

Details Ring coupling model - Implications for the ground state of the magnetosphere Ring coupling model - Implications for the ground state of the magnetosphere

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..369c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 369-374.

Physics

3

Atmospheric Electricity, Earth Magnetosphere, Geomagnetism, Polar Caps, Electric Fields, Electric Potential, Interplanetary Magnetic Fields, Magnetic Storms, Ring Currents

Scientific paper

Theory and observations both indicate that, in the range of transpolar potential greater than 20 kV, polar cap size depends weakly on the potential, and is substantial throughout this range. If the polar cap boundary is defined as that between sunward and antisunward convection, and the ground state of the magnetosphere is defined as the state in which there is no potential drop across the polar cap, then the magnetosphere has no polar cap in its ground state. The observation of a finite polar cap after extended periods of northward IMF implies that a small transpolar potential must be generated by some mechanism, together with magnetic merging.

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