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(a) Daily mean uncorrected proton differential flux as measured by NOAA-15 P1 channel (30–80 keV) shaded in black. A running mean with a 6-month window is applied and plotted in solid and dashed lines on top. (b) 6-month running mean of 90° detector flux divided by that of the 0° detector. (c) The daily sunspot number shaded in grey. A moving average with a window of 6 months is applied to the data, and plotted in solid line on top. All panels show the period August 1998 to December 2014, each tick on the x-axis shows the 1st of January that year.
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