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Hourly values of the Dst index have been analysed for lunar semidiurnal tides over four 5-year intervals. It is shown that the significant tides obtained can be related to the lunar geomagnetic tides at the contributing stations, which are produced by the lunar ionospheric and oceanic dynamos. No lunar tide in the ring current can be isolated.
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R. J. Stening (1990) studied this question.
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