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It is postulated that at least some types of whistler signals, e.g., ‘long trains,’ are generated by synchronous interaction between an energetic upward discharge from the top of a thundercloud and the extraordinary component of a sferic that lags the discharge by a time of the order of a second. The nature of the over-all generation mechanism is outlined, and the evidence for each phase is reviewed. An elementary theory of the synchronous interaction is stated.
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William C. Hoffman (1960) studied this question.
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