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In two high-altitude rocket flights of thin-walled Geiger tubes at geomagnetic latitudes 64^ and 74^, a considerable intensity of soft radiation has been encountered above 50 kilometers altitude. No such radiation has been found in flights of identical equipment at 88. 5^ and at 55. 6^. The radiation is tentatively interpreted as the high-energy tail of the auroral spectrum. It may consist of electrons.
Meredith et al. (Sat,) studied this question.
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