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It has been known for some time that there is a close connexion between the inequalities in the state of the sun’s surface as denoted by sun-spot areas and those in terrestrial magnetism as denoted by the diurnal ranges of oscillation of the declination magnet; and moreover the observations of various meteorologists have induced us to suspect that there may likewise be a connexion between solar Inequalities and those in terrestrial meteorology.

proceedings of the royal society of london

III. Report to the Solar Physics Committee on a comparison between apparent inequalities of short period in sun-spot areas and in diurnal temperature-ranges at Toronto and at Kew