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A decrease in frequency of magnetic storms at new moon which was previously demonstrated has been further analyzed and shown to apply only to the ‘gradual-commencement’ type of storm, whereas sudden-commencement storms show an increased frequency at that time. Suggestions that Venus and Mercury influence magnetic disturbances near their inferior conjunctions with the earth are verified and extended, and it is shown that the position of the moon at these times is also important. The possibility that the ‘blue clearings’ of Mars are related phenomena is also considered.
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E. K. Bigg (1963) studied this question.
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