Abstract
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.
Highlights
Global electromagnetic (Schumann) resonance occurs in the thin dielectric shell separating the conducting ground and the ionosphere plasma
Observations at a field site are characterized by two factors: one depends on the universal time and the other is the function of the local time
The first depends on the Universal Time, while the second is a function of the Local Time
Summary
Global electromagnetic (Schumann) resonance occurs in the thin dielectric shell separating the conducting ground and the ionosphere plasma. The further step was made by Pechony and Price (2006), who computed the intensity of the global resonance in the model of a uniform Earth-ionosphere cavity and demonstrated that local modulations still remain in the model data They used the time varying thunderstorm distributions in model that follow from the records of Optical Transient Detector (OTD) satellite. The model intensity variations were computed in the uniform Earth-ionosphere cavity with the thunderstorm distribution based on the global OTD maps of lightning flashes (Hayakawa et al, 2005; Nickolaenko et al, 2006; Pechony et al, 2006). The algorithm is applied to the long-term experimental records of SR at the same two points and the estimates are found for diurnal/monthly variations of the global thunderstorm activity for the period one year long
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