Abstract
THERE have been several attempts to detect lunar tidal variations in the ionosphere from the geomagnetic records1. These earlier attempts used the method of classical harmonic analysis, and sought to determine the amplitude of the important semidiurnal component. The availability during the International Geophysical Year of continuous geomagnetic data from many stations has made it possible to use power spectrum analysis, and resolve the individual frequency components of the lunar effect on the magnetic record2. The results of such a spectrum analysis for Godhavn are displayed in Fig. 1. The components with periodicities centred around the separately. The various components are identified by the symbolism adopted by Schureman3 and Bartels4 for tidal components.
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