Abstract
This Letter addresses two major questions on the substorm size, arising from our experience in measuring some of the key variables in the magnetosphere-ionosphere system during substorms. The two issues are: Why are there a large variety of substorms in terms of their size? and What is the smallest substorm? It is contended that both the substorm initiation location in the magnetosphere and the partition rate between auroral electrojet energy and ring current energy are crucial in determining the size of the electrojet intensity of individual substorms.
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