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Fig. 3


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Monthly mean value of (a) IMF ULF power, (b) ground ULF power, and (c) solar wind speed in 1998–2008. Each vertical bin contains the mean log monthly ULF power in (a) and (b), and the mean radial solar wind speed in (c). White dashed lines separate the figures by seasons, and blue solid lines show the places where the solar cycle phase changes.

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