Concurrent Equatorial and High-Latitude Geomagnetic Pulsations


  • W. H. Campbell


Examples of various concurrent ULF field fluctuations observed at: Jicamarca (Peru), College (Alaska), and Byrd (Antarctica) are presented to demonstrate the similarity of geomagnetic micropulsations of both Pi and Pc types at equatorial latitudes. The beginning of one Pi 1 event showed as much as 10-sec difference in onset times at a world distribution of stations. The apparent arrival of the signal varied according to the geomagnetic latitudes of the observatories. Magnetospheric sources of geomagnetic pulsations may be observed with equatorial station data.