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Abstract
Digital spectrograms have been computed for 18 days of geomagnetic pulsation activity at three UK Earth current stations ( L = 2.6−3.6). Three main conclusions are drawn: (1) There are days when the period of the dominant spectral amplitude is ordered according to the observatory latitude. The most frequently observed large amplitude spectral peaks are centred on 80, 60 and 45s for South Uist ( L = 3.6), Eskdalemuir ( L = 3.1) and East Anglia ( L = 2.6). respectively. (2) There are other days when the period of the dominant spectral amplitude is the same at all the observatories. (3) When Pc 3 and 4 period waves have been detected together, the latitude dependence of the amplitudes supports the theory that the shorter period pulsation is enhanced in the plasmatrough while the longer period wave is enhanced within the plasmasphere.
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