Abstract
The geomagnetic lunar daily variation field, L, was studied using all available results of lunar analysis of geomagnetic data from a total of 37 stations. Equivalent external (overhead) and internal (induced within the earth) electric current systems responsible for L variations with respect to dip latitude were estimated by the method of spherical harmonic analysis for each season. The external and internal current systems obtained for a mean lunation during the average solar activity period show more plausible current patterns with reasonable amount of total current intensities than any previously obtained.
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