Word: sunspots
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...have seen the same statement made independently at a more recent time that great international crises, such as wars, peace treaties, and other evidences of international amity or friction, follow the period of sunspot activity with some fidelity...
...Sunspot activity is a stimulant to human behavior, perhaps also an irritant. In 1928, the "good old days" there was a period of maximum sunspottedness when a maximum amount of ultra-violet was being ejected to the earth...
...view of sunspot effect on radio was presented last week in Science by Radio Section Chief John Howard Dellinger of the U. S. Bureau of Standards. Dr. Dellinger had noticed a curious fade-out of daytime reception of high-frequency signals, occurring at almost uniform intervals approximating 54 days, twice the sun's rotation period. These mysterious mufflings, lasting a few minutes, were perceived this year on March 20, May 12, July 6, Aug. 30. Accordingly Dr. Dellinger predicted another fade-out on or just before...
Fortnight before that date a burst of sunspot activity began. Nevertheless high-frequency reception over that half of the world lighted by the sun improved instead of faltering. Indeed by Oct. 21-23 it was the best the Bureau had ever observed. Next day-the crucial day-reception fell off sharply by half, and the expected fading occurred. Simultaneously the uppermost main layer of the ionosphere (radio-reflecting region of electrified air) rose from 155 mi. to a record height...
...Dellinger now believes that high-frequency daytime reception improves with sunspot activity, possibly because increased ultraviolet radiation from the sun at such times makes more ions in the ionosphere. The magnetic shifts resulting from the ultraviolet bombardment, however, may cause delayed interferences with low-frequency reception and night reception in general...