Diurnal and Seasonal Variations in the Intensities and Peak Frequencies of the First Three Schumann-resonance Modes

Abstract

We present the results based on long-term continuous Schumann-resonance measurements at the Lehta station. Diurnal and seasonal variations in the peak frequencies and intensities of the first three modes of the electric-and magnetic-field components are obtained. The experimental results are compared with the two-component model of thunderstorm activity and the model constructed with the use of the Optical Transient Detector data.

Universal and local time variations deduced from simultaneous Schumann resonance records at three widely separated observatories

“…Two source models are used. The first, the simple model is the compact source [Yatsevich et al, 2006[Yatsevich et al, , 2008: the global thunderstorms occupy a compact area (15°radius) at the equator and move around the globe during the day. The source intensity appropriately varies in time.…”

“…[63] The second, more realistic source model that we used in tests is based on the Optical Transient Detector (OTD) data [Christian et al, 2003;Hayakawa et al, 2005;Nickolaenko et al, 2006aNickolaenko et al, , 2006b]. We computed integrated Schumann resonance intensity in the uniform Earth-ionosphere cavity by using the DMM (Diurnal Monthly Mean) maps of average global distribution of lightning flashes [Pechony and Price, 2006;Pechony, 2007;Yatsevich et al, 2008]. DMM is a special processing of original OTD data [Pechony and Price, 2006;Pechony, 2007].…”

Schumann-resonance records at three observatories and ULF universal- and local-time variations

“…For a more complex pattern of the relative position of the sources and observers we will use a model based on the OTD (Optical Transient Detector) spacecraft data [7]. In this model, the location and intensity of the sources is specified on the basis of the maps obtained as a result of space observations of global thunderstorms [8].…”

“…In this model, the location and intensity of the sources is specified on the basis of the maps obtained as a result of space observations of global thunderstorms [8]. Small statistics of the data impedes the obtaining of quantitative relationships between the observed and calculated Schumann-resonance signals [7,9]. However, the OTD spacecraft data give a qualitative idea of the distribution and dynamics of the global thunderstorm activity, and from this point of view are quite applicable for checking the procedure.…”

Development of a Schumann-resonance station in Mexico: Preliminary measurements

“…The Schumann-resonance frequencies are given by the following equation: The Schumann-resonance variations are caused by global atmospheric lightning, and geophysical and solar activity. The Schumann resonance presents clear daily and seasonal changes [3][4][5]. The study of the Schumann resonance has become very important, as these signals can monitor seismic events [6,7], climate [8][9][10][11], the ionosphere [3], solar activity [12][13][14], or could even impact human health [15,16].…”