Abstract
The ap index (and derived indices) can be recalibrated by using Mayaud's am index to recover the correct universal time variations. Such variations were artificially removed in the original ap index. A number of tests are performed to show that the corrected index is capable of revealing the desired variations. These tests include comparisons of the universal time variations on days of opposite interplanetary magnetic sector polarity. The finding that geomagnetic activity was considerably higher during intervals of toward polarity prior to 1963 is strongly confirmed.
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