Low‐energy nucleonic cosmic‐ray data from stations at Lincoln, Mt. Washington, Sulfur Mountain, and Deep River were studied with regard to onset times, time and magnitude of maximum increase, and decay characteristics. The decay behavior underwent a definite transition that is clearly related to the termination of the optical flare. The first part of the decay is clearly exponential, with a time constant in the neighborhood of 17 minutes, whereas the latter part is not distinctly established either as exponential (with a possible time constant of 78 minutes) or as following a t−1.5 law. Ordinary impact zones do not seem to fit the pattern of increases observed at various stations in the northern hemisphere.
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