Relationship between Solar Activities and Precipitation in the Yellow River Basin

The solar activities might affect precipitation in the Yellow River Basin. The Morlet wavelet method is applied to analyze the changes of wavelet coefficients of precipitation and sunspots at same time scales. The research shows that there are negative correlations between precipitation and sunspots and they are most obvious in 9-year time scale. Furthermore, the precipitation lagged behind the sunspots by 1—2 years.

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