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Fig. 10

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Time-of-day (UT)/time-of-year (F) plots of the modelled sensitivity of the aa index, Saa, for various years. The left-hand and right-hand columns are for relatively high and low geomagnetic activity (defined as for Fig. 9), respectively. Plots are for: (a) and (b) 2010; (c) and (d) 1970; (e) and (f) 1930 and (g) and (h) 1890.

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