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Histogram of observations and forecasts, and the prediction error of background solar wind during 2007–2016. From top to bottom: Histogram of observations and forecasts of solar wind speed (V sw), proton density (ρ), strength of magnetic field (B) forecasts, histogram of prediction error of solar wind speed (∆V sw), prediction error of proton density (∆ρ), prediction error of strength of magnetic field (∆B). The black bar represents the observations from ACE spacecraft. The red, green, and blue lines represented the forecasts derived from function 1, 2, and 3, respectively.
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