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The evidence for the corpuscular theory of magnetic storms and aurorae is briefly reviewed. No certain success has attended the efforts made to detect the solar corpuscles during their emission from the sun or their passage to the earth; recent observations of atomic hydrogen lines in the auroral spectrum, which are broadened and displaced by Doppler effect, give the most direct support yet available to the corpuscular theory.
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Sydney Chapman (1950) studied this question.
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