Abstract
The previously studied variation of geomagnetic activity with lunar phase indicates a general decrease in geomagnetic activity of about 4% for several days before full moon and an increase of about 4% for several days after full moon. Substantial evidence is presented indicating that the observed variation of geomagnetic activity with lunar phase requires lunar latitudes at full moon within about 4° from the ecliptic plane. It is demonstrated that the influence of a variable lunar parallax must be extremely small, if it exists at all. Some difficulties are presented with both a tidal mechanism and a geomagnetic tail-neutral sheet mechanism for explaining the observed variation of geomagnetic activity.
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