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Recalibration of Bartels' Geomagnetic Activity Indices Kp and ap to Include Universal Time Variations,
STANFORD UNIV CALIF INST FOR PLASMA RESEARCH
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The ap index and derived indices can be recalibrated using Mayuads 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 correct index is capable of revealing the desired variations. These tests include comparisons of the UT-variations on days of opposite interplanetary magnetic sector polarity. A finding, that geomagnetic activity was considerably higher during intervals of Toward polarity prior to 1963, is strongly confirmed.
APPROVED FOR PUBLIC RELEASE