Diurnal and seasonal results of the Schumann Resonance Observatory in Sierra de Filabres, Spain

Abstract (English)

This paper presents the variations of the Schumann Resonances (SR), obtained in the Extreme Low Frequency (ELF) signal observatory of Sierra de Filabres belonging to the University of Almería, Spain, in operation since 2011. This station has two large and sensitive orthogonal sensors operating between 1 Hz and 100 Hz. A 24-bit low-noise, high-resolution system process the signal. The Sierra de Filabres ELF station is currently operating to offer interesting information on the activity of the Schumann Resonances in this area. This system allows us to have a broader range of comparison patterns, to study correlations with other phenomena. The information presented in this work deals with the diurnal and seasonal variations of the first six modes of the Schumann Resonances in 2016 and 2017. The graphs have been obtained through Lorentzian functions. We explain the diurnal variation based on the position and distance to the most important lightning hotspots and demonstrate its relation with the first mode captured in our observatory. We introduce a new yearly evolution method based on following the resonance frequency through the most representative lightning activity hours in one year. This paper is supported by the comparison between our signals and the global thunderstorm center's activity.

Other (English)

• Observatories,
• Ground penetrating radar,
• Geophysical measurement techniques,
• Lightning,
• Resonant frequency,
• Antennas,
• Registers