Abstract
Rubidium magnetometer recordings, made at three U.K. observatories during September 1964, were analyzed by the Power Spectral Density method. Spectral form and its variability are shown to be complex and a qualitative assessment is given of the features of pulsation activity which are exhibited by the spectra. Results are given of an attempt to investigate closely the fine structure of Pc spectra and its variability with time of day. There is evidence that the periods exhibited by pulsation spectra occur in harmonic progressions. A simple superposition of two or three harmonic progressions, with fundamental periods ranging from 150 sec to 250 sec, is sufficient to explain most spectra. The selectivity of pulsation activity in the Pc 3 range is greater than has previously been thought and the interpretation supports the view that discrete regions of the magnetosphere resonate and that variations of observed pulsation activity between stations are due to this fact and to multiple connection paths between source and ground.
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