Solar and Magnetic Activity and Radio Transmission

In this paper curves are shown indicating a connection between the annual averages of sun spot numbers and daylight radio signal strength of Nauen, Germany, as received in Washington from 1915 to 1929. The curves of the monthly averages of sun spots and daylight transatlantic signals for the years 1924-1929 show little evidence of correlation. On the other hand, the correlation between these monthly average signals and terrestrial magnetic activity seems definite. Reception from Monte Grande (Argentina) shows less definite and on the whole inverse correlation with magnetic activity. This indicates that long waves, like the ultra short, are more influenced by magnetic activity when traveling across the earth's magnetic field than when traveling parallel to it.