Studies on Radio-Atmospheric Disturbances

I. Directional Observations at Tôkyô

Abstract

The present paper contains a preliminary account on the directional observations of atmospherics at Tôkyô. The observations were commenced in July 1926, and is now being continued. The apparatus employed is a simple radiogoniometer. The loop antenna is five feet square and consists of 60 turns of thin stranded wire wound with 1/4 inch spacing, and is tuned to a wavelength of 10, 000 metres. With suitable amplifications records of atmospherics are obtained by means of a high frequency oscillograph; directing the loop to various azimuths, the number of atmospherics per eight seconds is obtained at each directions.
Although it would be very much premature to draw a definite co clusion from the observations extending only a short period of time on t e nature of such a geophysical phenomenon as the radio-atmospheric disturbance which seems to suffer the influences of various causes, yet the results so far obtained seem to indicate, that the majority of the atmospherics observed at Tôkyô come from a definite region, which varies according to the season.
The apparent direction of arrival of most atmospherics at Tôkyô during summer and autumn, when they are most prevalent, are given in the following table :