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Average variations with fraction of year, F. The data are for 1995–2019, inclusive and are binned into 36 equal width bins of F (each just over 10 days in length) and a 3-point boxcar running mean applied. The data are then normalised by dividing by the mean for all samples. (a) Shows the normalised variation in power input into the magnetosphere, P α (red line); the solar wind dynamic pressure, p sw (blue line) and the am index (black line). (b) The variations of the component terms in p sw (which is again shown by the blue line): the mean solar wind ion mass, m sw (orange line); the solar wind number density, N sw (green line) and the square of the solar wind speed, V sw 2 (mauve line). The black dashed line is the inverse square of the Sun-Earth distance, . The vertical dot-dash lines mark the equinoxes.
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