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In the past year evidence has been accumulating that high-energy nucleons arrive at the earth following solar disturbances. Such an event is described which occurred on May 12, 1959. Ion chambers, Geiger and scintillation counters, and photographic emulsions were exposed above Minneapolis at a pressure altitude of 10 g/cm/sup 2/ throughout the period of enhanced intensity. The integral fiux of particles at the top of the atmosphere increased by approximately a factor of 1000 above that of cosmic rays, and the composition of the incoming fiux was essentially pure hydrogen. (W.D.M.)
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Ney et al. (1959) studied this question.
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