The random variations of intensity of signals from point sources caused by the ionosphere greatly affect studies of cosmic static. One cause of these fluctuations is the condition known as spread F, which indicates the presence of diffuse and irregular echoes from the F-region of the ionosphere. Analyses of spread F over Hawaii were completed for the period 1944–1953. The diurnal and seasonal properties are discussed, and a conclusion is reached regarding latitude and longitude effects. Some properties of scintillations at decameter waves are described.