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Ann. Geophys., 26, 813-822, 2008
www.ann-geophys.net/26/813/2008/
© European Geosciences Union 2008
Universal and local time components in Schumann resonance intensity
A. P. Nickolaenko1 and M. Hayakawa2
1Usikov Institute for Radio-Physics and Electronics, National Academy of Sciences of the Ukraine, Kharkov 61085, Ukraine
2The University of Electro-Communications, Department of Electronic Engineering, Chofu-shi, Tokyo, 182-8585, Japan
Abstract. We extend the technique suggested by Sentman and Fraser (1991) and discussed
by Pechony and Price (2006), the technique for separating the local and universal time
variations in the Schumann resonance intensity. Initially, we simulate the
resonance oscillations in a uniform Earth-ionosphere cavity with the
distribution of lightning strokes based on the OTD satellite data. Different
field components were used in the Dayside source model for the Moshiri
(Japan, geographic coordinates: 44.365° N, 142.24° E) and Lehta
(Karelia, Russia, 64.427° N, 33.974° E) observatories. We use the
extended Fourier series for obtaining the modulating functions. Simulations
show that the algorithm evaluates the impact of the source proximity in the
resonance intensity. Our major goal was in estimating the universal
alteration factors, which reflect changes in the global thunderstorm
activity. It was achieved by compensating the local factors present in the
initial data. The technique is introduced with the model Schumann resonance
data and afterwards we use the long-term experimental records at the above
sites for obtaining the diurnal/monthly variations of the global
thunderstorms.
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