Kp dependence of auroral zone field-aligned current intensity

Details Kp dependence of auroral zone field-aligned current intensity Kp dependence of auroral zone field-aligned current intensity

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1743r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, March 1, 1984, p. 1743-1748.

Physics

15

Auroral Zones, Current Density, Field Aligned Currents, Geomagnetism, Ionospheric Currents, Kp Index, Current Sheets, Electrical Resistivity, Radar Measurement

Scientific paper

More than 200 hours of Chatanika radar elevation scan data have been used to show that the Pedersen current in the ionosphere is limited to a value that is proportional to the planetary magnetic index Kp. By assuming a simple model for the closure of field-aligned currents in the ionosphere, it is argued that this limit is equal to the latitudinally integrated field-aligned current intensity. A least-squares fit to the data gives the limiting current intensity J sub 0 by the following expression: J sub 0 (A/km) = 97 + 71 x Kp. As an extension of this result, a previously derived relation between polar cap potential drop and Kp to establish a current-voltage relationship for the magnetospheric generator is used. It is also shown how these results can be used to put an upper limit on the Joule heating rate for a given polar cap potential drop.

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