Word: sunspots
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...revolved in its 25-day cycle, the beam of the vast sunspot which erupted from its surface (photosphere) late in July was again to touch the earth this week. At that time the spot was 33,000 miles long by 20,000 miles wide. On earth, it caused severe magnetic storms which affected electric light and power services, confused telegraphs, telephones, radio...
...This sunspot may have something to do with the drought which the past fortnight has afflicted U. S. farmers, restricted the water supplies of many communities (TIME, Aug 12), made tinder for forest fires. Sunspots become active in regular 11-year cycles. Although the present cycle was at its top in 1928, its 1929 decline has been little, according to measurements at the special solar observatories in southern California, Chile, South Africa. But although the earth is now getting more sun heat than normal, that is probably not the whole cause of the 1929 drought. More direct causes were...
While it has been evident that increasing sunspot activity has been accompanied in general with a decrease in intensity of radio signal strengths received, exceptions occur from time to time due, in part, to atmospheric and possible meterological changes. It has furthermore been possible to obtain a degree of correlation between barometric gradients and the intensity of reception received. It is by taking moving averages of several days data that the sunspot intensity correlation becomes markedly apparent...
...study of the graphs further shows that a rather definite fifteen month period in solar activity exists as exhibited by both spots and radio reception. This is one of the outstanding results of the investigation to date. Each of these sunspot sub-maxima have indicated increasing solar activity and it does not yet appear possible to state that we have reached the real maximum of the sunspot cycle until the sun peak of 1929 is reached and passed. The intensity of that peak will doubtless decide whether or not the maximum of the present sunspot cycle is reached...
...view of the fifteen months period of maxima and minima which appears to be definitely located both in the sunspot and radio curve, we may look for another maximum of solar activity in September or October...