An experiment designed to measure the coherence of natural geomagnetic signals at two stations 10 kilometers apart is described. A qualitative measurement was performed on a section of 1 c.p.s. signal (of unusual occurrence) and a quantitative measurement on a section of normal daytime record. The coherence tends to be high for moderate signal levels.
No takes yet. Share an insight, caveat, or question.
Duffus et al. (1962) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: