The Observation of ELF Electro-magnetic Field from 3 to 30 cps (partⅠ)
Kondo, G.
Abstract
The ELF electro-magnetic field from 3 to 30 cps have been observed at Kakioka and Memambetsu during IQSY. These stations are not so far from commercial electric power line, but the observation can be done by the use of the strong filter, the low noise amplifier with the battery and the very low speed magnetic tape recorder.
The reliability of the received signal was checked by the simultaneous observations at three couples of far separated stations, Kakioka-Tateno, Kakioka-Chihama and Kakioka-Memambetsu.
The received signal consists of the basic oscillation of some mγ and the individual oscillation of about ten mγ or more. The occurrence frequency of this individual oscillation has daily variation, of which maximum is at about 15h and minimum is at about 02h (UT).
The sonogram of received signal shows that the ELF electro-magnetic field mainly consists of the Schumann's oscillation.
