Word: sunspots
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Dates: during 1925-1925
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...displays of the aurora borealis. Just what influence the sun exerts-whether cathode rays, Hertzian waves or negatively charged particles-to cause "the dance of the dead men," the "merry dancers," the Polar or Northern Lights, is undetermined by scientists. But two centuries of observation have indicated that sunspot years are aurora borealis years, the phenomenon, ordinarily confined to polar regions, being sometimes visible as far south as Yucatan in the Western Hemisphere and Gibraltar in the Eastern...
...That-according to reports based on the first photographs developed-there was a considerable number of prominences, or projections of the Sun's corona. This was unexpected, since the prominences are believed to be connected with sunspot activity, which at present is small...