The Relation of Radio Propagation to Disturbances in Terrestrial Magnetism

This paper presents the results of a study of an apparent inter-relationship between radio reception and changes in the earth´s magnetism. The results show that for long-wave daylight reception over great distances 4,000 to 7,100 km) there is in general a variable but definite increase in the intensity of the received signal following the height of severe magnetic disturbance. This increase reaches its maximum in from one to two days and disappears in from four to five days. For moderate distances (250 to 450 km) there is an increase in the intensity of the received signal noticeable before as well as after the magnetic storm reaches a maximum. These changes in intensity cover periods from two to four days both before and after the magnetic storm reaches its height.