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We have been continuously observing the daily 7 Be concentrations in surface air at Yamagata, Japan (38.25° N, 140.35° E) since 2000. The yearly profile of the 7 Be concentration indicates the variation in galactic cosmic rays owing to solar modulation. Over 8y, the 7 Be concentration, cosmic neutrons, and number of sunspots varied by 37.4%, 12.2%, and 92.8%, respectively....
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