L. A. Frank, K. L. Ackerson, W. R. Paterson, R. L. Dyson,
G. T. Parmentier, and G. L. Pickett
This document was adapted from an article which originally appeared in the Journal of Geomagnetisim and Geoelectricity, vol. 46, pp. 23-37, 1994. © 1994 Terra Scientific Publishing Company.
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