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

Abstract

A technique is applied to experimental Schumann resonance intensity that separates the universal (UT) and local time (LT) variations. Two orthogonal horizontal magnetic field components were recorded simultaneously at the observatories of Moshiri, Japan (44.4°N, 142.2°E), Lehta, Russia (64.4°N, 34°E), and West Greenwich, Rhode Island, United States (41.6°N, 71.6°W). We use the cumulative magnetic field power integrated over the first three Schumann resonance modes. Diurnal variations were averaged over a month for the period from August 1999 to December 2001 at each site. These records were combined to obtain estimates for the UT daily patterns of the global thunderstorm activity. Diurnal variations of particular months repeat year after year, indicating that space‐time distributions of global thunderstorms are annually replicated with minor deviations. Another technique, based on geometric averaging of records, was used to obtain alternative estimates of the global thunderstorm intensity. Results acquired with both techniques showed an outstanding similarity.

Schumann Resonance for Tyros

“…So as to reduce an impact of the modal structure of resonant field, the thunderstorm intensity is evaluated from the cumulative SR intensity, i.e., the field intensity integrated in the frequency band covering the three first modes A. Nickolaenko and M. Hayakawa, Schumann Resonance for Tyros, Springer Geophysics, DOI: 10.1007/978-4-431-54358-9_10, Ó Springer Japan 2014 Nickolaenko et al , 2011aHayakawa 2002, 2010a). Therefore, the intensity of resonance must reflect the present state of atmospheric electric activity worldwide.…”

Full 3‐D TLM simulations of the Earth‐ionosphere cavity: Effect of conductivity on the Schumann resonances

“…The main goal of this paper is the numerical study of the electric conductivity influence on the resonances in the Earth‐ionosphere cavity, mainly the conditions for their existence and their dependence on the distance to the source. Part of the interest in this spatial feature relates to its possible application to SR inversion studies, where an attempt is made to obtain information about the sources, i.e., the lightning activity centers, by detecting variations in the SR [ Shvets et al , ; Nickolaenko et al , ; Mushtak et al , ]. As regards the steep variation effect around the nodal points, this was recently observed by simultaneous measurements from two stations 550 km apart.…”

Scattering of Extremely Low Frequency Electromagnetic Waves by a Localized Seismogenic Ionospheric Perturbation: Observation and Interpretation

“…After the declining phase of SR studies in 1980s, Williams (1992) suggested the use of SR data as a promising indicator of global warming of our greatest concern, and SR got a new life. The SR can be utilized extensively to monitor the characteristics of global lightning and global warming (Heckman et al, 1998; Nickolaenko et al, 2011; Nickolaenko & Hayakawa, 2008; Price et al, 2007; Satori et al, 2009; Sekiguchi et al, 2006). The recent outstanding application of SR has been suggested by Shvets and Hayakawa (2011) and Pracser et al (2019) on the inverse problem based on the SR data observed at a few ELF stations on the globe in order to monitor the global lightning activity in real time.…”