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On September 20, 1963, the Injun 3 satellite, at an altitude of 2350 km, passed within close proximity of a balloon X-ray detector at 35-km altitude. During a transit of the L shell of the balloon, a marked correlation in the increases of flux of the satellite-precipitating electron E ≥ 40-kev detector and the balloon X-ray E ≥ 30-kev detector is found. These results place a lower limit of 430 km east-west extent of the mutually observed pulsation event.
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Milton et al. (1967) studied this question.
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