Substorm energy |
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Authors: | S-I Akasofu Y Kamide |
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Institution: | Geophysical Institute, University of Alaska, Fairbanks, AK 99701, U.S.A. |
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Abstract: | It is shown that the area Ak(× 106km2) covered by brightest auroras and the area Aq bounded by the auroral oval have a simple relation given by , where A0 denotes the area of the minimum size oval and the quantity (Aq ? A0)2 is proportional to the energy εq which is stored in the magnetotail and is available for substorms. Following the definition of the intensity of solar flares, Ak may be chosen as a measure of the intensity of substorms. It is also found that the joule heat energy produced by the auroral electrojet is also proportional to (Aq ? A0)2. Thus, it may be concluded that the intensity of substorms is proportional to the energy εq stored in the magnetotail. |
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