Solar Activity and Radiotelegraphy

This report to the International Research Council on solar and radio relationships shows that the relationships are closer at short wavelengths than at long, that the effect of magnetic storms, which are assumed to be due to solar action, is, in general, to weaken night signals at all wavelengths and in the medium and long-wave ranges to strengthen day signals. Curves are given which show that there is a direct correlation between the yearly averages of long waves, daylight transatlantic signals, sun spot numbers, and magnetic activity (1915-1930), a direct correlation between signals and magnetic activity averages by months (1924-1930), and an inverse correlation between sun spots and atmospheric disturbances averages by years (1918-1930).