Word: sunspot
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...Solar investigations are being undertaken at the Laboratory of Astronomy during the present sunspot maximum and include the daily photography of the sun's surface. The measurement of the sun spots, which are regions of electrical disturbances or storms on the surface of the sun, is being carried out in cooperation with the Mt. Wilson Observatory, the Yerkes Observatory, and the United States Naval Observatory," Professor Stetson said...
...what effect these electrical storms, which might be compared to cyclones or hurricanes on the earth, have on the strength of the radio waves. By comparing the graphs of the sun spots and the radio reception we were gratified to discover that, invariably, as the number and intensity of sunspots increased, radio reception grew worse, until, at the peak of the period of sun spot activity, called the Sunspot Maximum, the radio signals reached their weakest point. Likewise, when the spots on the sun were fewest and weakest, the radio reception was best. For the measurement of radio reception...
...proven that a definite correlation exists between radio reception and sunspot activity by comparing graphs made of the results of the various experiments...
...special equipment has been installed at the Laboratory for preparing the sunspot data. After the photograph has been made the image of the sun is projected by a special optical lantern onto a white globe, so that the position of the spots on the sun's surface can be accurately determined. The number and the location of the spots, with their areas, is forwarded to Washington...
...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...