Abstract
The ground magnetic field variation in the extremely low frequency (ELF) range has been measured by an induction magnetometer at Kuju, Japan (KUJ; M.Lat. = 23.4 degrees, M. Lon. = 201.0 degrees) since 2003. The first mode of the Schumann resonance (SR) around 8 Hz can be seen at KUJ. The SR in H (horizontal northward component) shows maximum peaks around 08 UT and 15 UT. In the case of D (horizontal eastward component), the SR shows its maximum peak around 08 UT. These peaks are coincident with the enhancement of lightning activity in Africa and Asia. Thus, we found the influence of the lightning activity on the observed SR at KUJ.
Highlights
The Schumann resonance (SR), whichwas detected by Blaser and Wagner [1960, 1962] for the first time, is the global resonance of electromagnetic waves generated by the global lightning activity.The resonance is formed by the Earthionosphere cavity and the specific resonance frequencies, which are about 8, 14, 21, and 26 Hz, appear in the ground magnetic field variation
The ground magnetic field variation in the extremely low frequency (ELF) range has been measured by an induction magnetometer at KUJ since 2003
We found the response of the SR power at Kuju to the global lightning activity
Summary
The Schumann resonance (SR), whichwas detected by Blaser and Wagner [1960, 1962] for the first time, is the global resonance of electromagnetic waves generated by the global lightning activity.The resonance is formed by the Earthionosphere cavity and the specific resonance frequencies, which are about 8, 14, 21, and 26 Hz, appear in the ground magnetic field variation. The diurnal variations of SR parameters reflect the properties of both the global lightning activity and the state of the Earthionosphere cavity. The variation in the amplitude of SR in a day show peaks which correspond with the three major thunderstorm centers, namely, African, Asian, and American [e.g., Sátori et al, 1996;Zhou et al, 2013].
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