Spatial comparison of PC-type geomagnetic micropulsations

Analog spectral analysis of geomagnetic micropulsations recorded simultaneously at pairs of stations differing in longitude and latitude indicates that the pulsations often have the same dominant periods at different stations. This suggests that the periods of micropulsations may be independent of longitude and latitude. Data obtained from a pair of stations separated in longitude indicate that the variations of intensity occur nearly simultaneously at both stations, but there is some indication of a local-time dependence with a maximum near local noon.