Hemispherical Joule heating and the AE indices

Details Hemispherical Joule heating and the AE indices Hemispherical Joule heating and the AE indices

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..383b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 383-388. Research supported by the Deutsche Forschun

Physics

46

Atmospheric Heating, Auroral Electrojets, Indexes (Ratios), Resistance Heating, Northern Hemisphere, Regression Analysis

Scientific paper

A linear regression analysis is conducted for Joule energy deposition rates that have been integrated over the Northern Hemisphere as a function of the standard auroral electrojet indices. A correlation coefficient of 0.7-0.9 is obtained. The hemispherical Joule heating rate can be calculated through the substitution of 1 nT in the AE index by approximately 0.3 GW. A higher scale factor is found for the regression between the Joule heating caused by eastward current versus AU than for that which is caused by the westward electrojet versus AL, consistent with the typically lower ionospheric conductivity values in the eastward electrojet region. These require higher electric fields and thus greater Joule heating for a given eastward current of AU value than for the same intensity of the westward electrojet.

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