As far back as biblical times, Man has searched for correlations between events in the heavens and events on Earth. In more recent times, scientists have looked for a connection between solar phenomena and the weather on Earth. Over the past twenty years evidence has been growing that variations in solar magnetic activity correlate with low‐pressure troughs in the Northern Hemisphere. The work has been pioneered by Walter Orr Roberts (University of Colorado and the National Center for Atmospheric Research, Boulder). In recent years others have collaborated with Roberts, for instance John M. Wilcox, Philip Scherrer and Leif Svalgaard at Stanford University, Roger H. Olson (University of Colorado) and Roy L. Jenne (National Center for Atmospheric Research).

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