Directional Observations of the Radio-Atmospheric Disturbances.

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The present paper contains the results of directional observations of atmospherics made at Tokyo extending over a period of two years from July 1926 to June 1928. The apparatus employed is mainly a simple radio-goniometer. The loop antenna is five feet square and is tuned to a wave-length of 10,000 metres. By counting the number of atmospherics received per unit time the apparent direction of arrival was determined, and the sources of atmospherics in Japan were investigated, with special reference to their relation with the meteorological environment. Several examples are given showing thunderstorms and lines of discontinuity in and in the vicinity of Japan as the sources of disturbances. When a typhoon or cyclone is approaching a very confused state in the occurrence of atmospherics takes place. It seems that in such cases intense and very sharply defined sources of disturbances are created in several places one after another. There are still evidences showing that many atmospherics come from the SSW direction, presumably from the tropics.