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Statistical observations at 60°–65° latitude: (a) plots of the percentage change in the peak density due to Kp increasing from the range 0–1 to 4–5; (b)–(e) plots of the quiet-time peak density for different seasons; (f) plots of the change in the mean hmF2 due to Kp increasing from the range 0–1 to 4–5; (g)–(j) plots of the quiet-time values of the mean hmF2 for different seasons. The plots are color-coded. See the text for details.
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