Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..223a&link_type=abstract
Planetary and Space Science, vol. 24, Mar. 1976, p. 223-227.
Physics
9
Auroral Electrojets, Energy Storage, Geomagnetic Tail, Kinetic Energy, Polar Substorms, Data Correlation, Particle Energy, Resistance Heating, Satellite-Borne Photography
Scientific paper
The relationships between the energy stored in the magnetotail and the total kinetic energy of auroral particles and the joule heat energy associated with the auroral electrojet are examined. Thirty DMSP satellite photographs clearly showing an oval with substorm features are analyzed. It is assumed that the equatorward boundary of the auroral oval area gives the boundary of the oval area just prior to substorm onset and that the brightest area gives a measure of the kinetic energy of auroral particles. The auroral behavior is assumed symmetric with respect to the noon-night meridian. The area covered by the brightest auroras is shown to be 0.05 times the square of the difference between the area bounded by the auroral oval and the area of the minimum size oval. The joule heat energy produced by the auroral electrojet is also proportional to the square of this difference. It is concluded that the intensity of substorms is proportional to the energy stored in the magnetotail.
Akasofu Syuh-Ichi
Kamide Yohsuke
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