Excerpt from The Norwegian Aurora Polaris Expedition, 1902-1903, Vol. 1: On the Cause of Magnetic Storms and the Origin of Terrestrial Magnetism
The knowledge gained, since 1896, in radio-activity has favoured the view to which I gave expression in that year, namely, that magnetic disturbances on the earth, and aurora borealis, are due to corpuscular rays emitted by the sun.
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