Fig. 1
Three-year running means of yearly averaged amplitudes of the first (A27, upper panels) and the second (A14, lower panels) harmonics of GCR for the Oulu (left panels) and Apatity (right panels) neutron monitor count rates in 1964–2016 during A > 0 epochs (cyan boxes with upward lattice) and A < 0 epochs (red boxes with downward lattice).
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