Abstract
A good case could be made for considering radio transmission itself as a geophysical subject and certainly its very evident relations with terrestrial magnetism and atmospheric electricity are an appropriate subject for the American Geophysical Union. It is, therefore, not merely a matter of interest to the members but a duty to consider the progress made in the investigation.The recent rapid growth of interest in the correlations of various radio phenomena with solar and terrestrial magnetic and electric activities is in part to be ascribed to the fact that perfection of transmitting and receiving apparatus makes it reasonable to assume that interference is to be ascribed to outside phenomena and not to the apparatus. An irreducible minimum is being reached beyond which new methods of attack are necessary and complete understanding of the phenomena involved. Improved apparatus for recording signal‐intensity is becoming an important factor in this situation.
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