The relation of radio‐wave propagation to disturbances in Terrestrial Magnetism

Abstract

From a study of the variation in long‐wave daylight signal‐intensity observed at the Laboratory for Special Radio Transmission Research, Bureau of Standards, and of the disturbances in terrestrial magnetism, it is concluded that there is a marked increase in the intensity of long‐wave signals following severe magnetic storms. In the case of long‐distance reception from European stations, there is a general tendency for the signal‐intensity to be below normal for several days before the maximum of the magnetic disturbance and to show a definite increase from one to three days after the passage of the storm. Observations taken on stations at moderate distances, that is, the Radio Corporation stations at Tuckerton and New Brunswick, New Jersey, and Rocky Point, Long Island, give somewhat different results. While the intensity of signal from these stations is high from two to four days after the storm, as in the case of the distant stations, there is also a decided increase in signal‐strength from two to four days before the magnetic disturbance. The complete paper is published elsewhere (Bur. Stan. J. Res., v. 2, 1201–1211, 1929; Inst. Radio Eng., v. 17, 1206–1213, 1929).