The geomagnetic nature of the F2‐layer longitude‐effect

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Abstract
Attention has been drawn to the extensive research on radio wave‐propagation and the ionosphere done by the Japanese during the recent war [see 1 of “References” at end of paper]. The Japanese, owing to the large number of ionospheric stations they operated, were able to delineate very well the essential characteristics of the ionosphere over eastern Asia and the western Pacific. As a result of their observations, together with the generally available observations made in other parts of the world before the war, the Japanese made the first known study of the longitude‐effect in the F2‐layer characteristics. They attributed the effect to geomagnetic influences.

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