Secondary products of the interaction of cosmic rays with the earth's atmosphere, when projected upward and when of an energy below the Störmer cutoff, are trapped by the earth's magnetic field and guided to an impact with the atmosphere in the hemisphere opposite that of their formation. These particles are called the re-entrant albedo. In the present paper we derive an expression for their intensity and make a simplified computation of a particular case where data are available for comparison.
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Ernest C. Ray (1962) studied this question.
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