Study of the variations in the Schumann resonances parameters measured in a southern Mediterranean environment

Tatsis, Giorgos; Christofilakis, Vasilis; Chronopoulos, Spyridon K.; Baldoumas, G.; Sakkas, A.; Paschalidou, Anastasia Κ.; Kassomenos, Pavlos; Petrou, Ilias; Kostarakis, P.; Repapis, C. C.; Tritakis, V.

doi:10.1016/j.scitotenv.2020.136926

Cited by 13 publications

(8 citation statements)

References 31 publications

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“…Much published material has appeared describing the standard (recurrent) daily and seasonal variations of SR spectral parameters (modal frequency, intensity and sharpness of maxima) at different stations (e.g., Sátori, 1996;Nickolaenko and Hayakawa, 2002;Price and Melnikov, 2004;Roldugin et al, 2004a;Ondrášková et al, 2007;Yatsevich et al, 2008;Toledo-Redondo et al, 2010;Zhou et al, 2013;Nickolaenko and Hayakawa, 2014;Fornieles-Callejón et al, 2015;Manu et al, 2015;Musur and Beggan, 2019;Tatsis et al, 2020). These standard variations in SR are mainly the consequence of the daily and seasonal variations of global lightning activity which fundamentally affect the observed SR spectral parameters (Sátori, 1996).…”

Section: Introductionmentioning

confidence: 99%

Solar Cycle-Modulated Deformation of the Earth–Ionosphere Cavity

et al. 2021

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The Earth–ionosphere cavity resonator is occupied primarily by the electromagnetic radiation of lightning below 100 Hz. The phenomenon is known as Schumann resonances (SR). SR intensity is an excellent indicator of lightning activity and its distribution on global scales. However, long-term measurements from high latitude SR stations revealed a pronounced in-phase solar cycle modulation of SR intensity seemingly contradicting optical observations of lightning from satellite, which do not show any significant solar cycle variation in the intensity and spatial distribution of lightning activity on the global scale. The solar cycle-modulated local deformation of the Earth–ionosphere cavity by the ionization of energetic electron precipitation (EEP) has been suggested as a possible phenomenon that may account for the observed long-term modulation of SR intensity. Precipitating electrons in the energy range of 1–300 keV can affect the Earth–ionosphere cavity resonator in the altitude range of about 70–110 km and modify the SR intensities. However, until now there was no direct evidence documented in the literature supporting this suggestion. In this paper we present long-term SR intensity records from eight stations, each equipped with a pair of induction coil magnetometers: five high latitude (|lat| > 60°), two mid-high latitude (50° < |lat| < 60°) and one low latitude (|lat| < 30°). These long-term, ground-based SR intensity records are compared on the annual and interannual timescales with the fluxes of precipitating 30–300 keV medium energy electrons provided by the POES NOAA-15 satellite and on the daily timescale with electron precipitation events identified using a SuperDARN radar in Antarctica. The long-term variation of the Earth–ionosphere waveguide’s effective height, as inferred from its cutoff frequency, is independently analyzed based on spectra recorded by the DEMETER satellite. It is shown that to account for all our observations one needs to consider both the effect of solar X-rays and EEP which modify the quality factor of the cavity and deform it dominantly over low- and high latitudes, respectively. Our results suggest that SR measurements should be considered as an alternative tool for collecting information about and thus monitoring changes in the ionization state of the lower ionosphere associated with EEP.

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Section: Introductionmentioning

confidence: 99%

Solar Cycle-Modulated Deformation of the Earth–Ionosphere Cavity

et al. 2021

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“…A set of batteries provides energy to the system, thus minimizing electric current noise. Additional technical details and structural demands have been described extensively in Tatsis et al [34,35] and Votis et al [36]. A broad view of the instruments appears in Figure 2.…”

Section: Place Time Kind and Main Characteristics Of Elf Observations In The Greek Areamentioning

confidence: 99%

How Effective and Prerequisite Are Electromagnetic Extremely Low Frequency (ELF) Recordings in the Schumann Resonances Band to Function as Seismic Activity Precursors

et al. 2022

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ELF recordings, especially in the 0–50 Hz range (Schumann Resonances), have gained great interest during the last twenty years because of their possible relation to many geophysical, climatological, solar, and even biological phenomena, which several well-known scientists have reported. A very important question that still has not been answered is whether some particular variations in the Schumann Resonances (SR) band operate as precursors of forthcoming seismic activity. Greece and the wider Mediterranean area are a very seismic territory where medium size earthquakes (4–6.5 Richter) occur very often, contributing to a high percentage of the natural hazards of the area. In our effort to make evident how effective and prerequisite SR recordings are in the detection of forthcoming earthquakes, we analyze data collected for almost five years by two SR stations located in the north and the south edge of the Greek territory, respectively. We have come to the conclusion that particular SR modulations are very useful in the predictability of forthcoming seismic activity, but they need to be completed with additional observations of adjoining effects which can contribute to the final decision.

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“…The existence of SRs was first confirmed by Balser and Wagner (1962) in 1960 through experimental observations. To date, many electromagnetic observation sites have been established worldwide to observe SRs, including in Antarctica (the Ukrainian station) and the Arctic Circle, where electromagnetic interference is low (Ando & Hayakawa, 2006; Ando et al., 2005; Chand et al., 2009; Fan et al., 2013; A. V. Koloskov et al., 2020; O. V. Koloskov et al., 2022; Kulak et al., 2003; Nickolaenko, 1997; Nickolaenko & Hayakawa, 2014; Ondrášková et al., 2007, 2008; Ouyang, Xiao, et al., 2015; Ouyang et al., 2013; Price & Melnikov, 2004; Rodríguez‐Camacho et al., 2022; Rossi et al., 2009; Sátori, 1996; Sátori & Zieger, 1996; Satori et al., 1996; Sentman, 1987; Sentman & Fraser, 1991; Shvets et al., 2010; Tatsis et al., 2020; Zhou et al., 2013a). In addition to ground‐based observations, beginning with the astute analysis of Madden and Thompson (1965), the leakage of SR energy through the night side ionosphere has been presented.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Interannual Variations in the Schumann Resonance Observed in the ELF Electromagnetic Networks in China

Han,

Tang,

Zhao

et al. 2023

JGR Atmospheres

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Based on 9 years of quasi‐continuous data observed at extremely low‐frequency electromagnetic stations, the long‐term variations of Schumann resonances (SRs) are compared and analyzed. We obtained two major parameters, namely the peak intensity and peak frequencies by Lorentz fitting and focus on their seasonal and interannual variations of the first three modes in 10 stations. Fengning station was taken as an example to show the seasonal variations of the intensity and frequency of each electromagnetic component and each mode of SR, with the intensity reaching the maximum in Northern Hemisphere summer and minimum in winter; while the frequency has an inverse phase. And the amount they change from summer to winter also shows different characteristics. The interannual variation of the 10 stations shows the unified law of change in the magnetic field than in the electric field. Finally, in conjunction with observations from other regions of the globe, the periodic intensity variation and migration of the lighting activities were considered the dominant controlling factors for the SR parameters. And by comparing with the El Niño index and solar X‐radiation flux, the strong links between SR parameters and the 11‐year solar cycle are confirmed, and intensity enhanced under the influence the 2015/2016 super E1 Niño phenomenon.

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Study of the variations in the Schumann resonances parameters measured in a southern Mediterranean environment

Cited by 13 publications

References 31 publications

Solar Cycle-Modulated Deformation of the Earth–Ionosphere Cavity

Solar Cycle-Modulated Deformation of the Earth–Ionosphere Cavity

How Effective and Prerequisite Are Electromagnetic Extremely Low Frequency (ELF) Recordings in the Schumann Resonances Band to Function as Seismic Activity Precursors

Seasonal and Interannual Variations in the Schumann Resonance Observed in the ELF Electromagnetic Networks in China

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