An analysis of the variation of absorption produced by nuclear air bursts during the transition period from night to day. For air bursts occurring at 100 km, some 15 to 30 minutes before sunrise, absorption increases from the nighttime value when the solar zenith angle reaches about 100 deg. The transition from night to day occurs over a time period some 30 minutes longer than that calculated by a lumped parameter solution of the rate equations. Data from three similar bursts occurring at solar zenith angles 96 deg, 90 deg, and 81 deg are compared. 15 pp.
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