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The induction arrows determined from the transfer functions calculated by making use of data on the 210°magnetic meridian geomagnetic observations were obtained at 17 stations. Using high-sensitivity ...magnetometers and data acquisition with a fast sampling rate (1 sec for every component) makes it possible to analyze the geomagnetic variation fields with various amplitudes and periods from a few seconds to a few hours. The results show that the magnitudes and directions of induction arrows obtained at several stations, especially at the six stations in Australia, are subject to considerable variation between 0.25 Hz (4 sec) and 0.00011 Hz (150min), Among those stations, the characteristics of geomagnetic variation fields observed Learmonth, North West Cape, Australia, were examined by using high-pass-filtered records. The frequency dependence of the induction arrows at Learmonth could be due to the concentration and bending of electrical currents induced in the ocean and underlying high-conductivity structure and to the magnetic shielding effect of the subsurface conductive layer in the higher-frequency range.show more
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29_02_p145