Geomagnetic bays, their frequency and current-systems

摘要: In extension of the previous work on bays by BIRKELAND, STEINER, WIECHERT, McNISH, CHAPMAN and BARTELS, HATAKEYAMA a study was made frequency current-systems geomagnetic bays. The field at ground-level is highly complicated variable, especially in auroral regions, hence ill-adapted for using data measured only small number points Earth. present based, therefore, selection from somewhat more complete Polar Year 1932–33 than available to earlier writers.