Lunar Geomagnetic Variations

Abstract

The lunar geomagnetic variation field, L, was studied based on all available results of lunar analysis from a total of 37 stations. Taking into consideration the electromagnetic induction effect within the earth, spherical harmonic analyses were made for three seasons, and corresponding equivalent overhead current systems were obtained by the separation of the external and internal origins.
The L current system including the lunar equatorial electrojet derived shows that the total current intensities during equinoxes and particularly winter are larger than those of previously obtained systems. The ratio of the total current intensity in summer and winter is less than two, and the intensity during equinoxes is similar to that in summer.