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Notes on Schumann resonance

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Schumann Resonance: Does Earth's 7.83 Hz "Heartbeat" Influence Our Behavior?

The Earth's magnetic field has a set of resonant frequencies that scientists theorize could have an effect on human behavior.

By Trevor English Aug 05, 2021

Schumann resonance

Excerpt from: Does Schumann resonance affect our blood pressure?

Published in Biomed Pharmacother 2005 Oct
Retrieved 12:52, 30 September 2021 (UTC) from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2656447/

" SR is a background stationary electromagnetic noise that propagates in the cavity between the earth surface and the lower boundary of the ionosphere at altitudes of 45–50 km, in the frequency range between 5 and 50 Hz [3,14,27–29]. The phenomenon was named after W.O. Schumann who first predicted and discussed it in 1950s [29]. Its peak intensity can be detected at ~8 Hz, along with its harmonics with lower intensity at 14, 20, 26, 33, 39, and 45 Hz due to frequency-related, ionospheric propagation loss [3,14,27–29]. The peak SR frequencies undergo a moderate diurnal variation of approximately ± 0.5 Hz [29]. Interestingly, the first four SR modes happen to be within the frequency range of the first four EEG bands (i.e. delta 0.5–3.5 Hz, theta 4–7 Hz, alpha 8–13 Hz, and beta 14 to 30 Hz) [6].

The amplitude of 8 ± 0.5 Hz SR background signals ranges between 0.5 and 1.0 pT Hz −1/2, and shows diumal and seasonal variations in response to stochastic redistribution of electric activity over the globe and resultant changes in the local height of the ionosphere at the respective observing sites [29].

Principal excitation source of SR is cloud-to-ground discharges, with the peak currents on the order of 20,000–30,000 A and the discharge rates of 100 times per s [29]. Because of such high discharge rates and remarkably small propagation loss, the associated electromagnetic radiations from individual lightning overlap to form a stationary background electromagnetic noise [14,29]. However, once in a while, middle atmospheric electrical current between the cloud tops and the ionosphere causes sufficiently large transients, called ELF transients, and excites the earth-ionosphere cavity to amplitude that may exceed the background by factors of 10–20 or more [29]. ELF transients have been found to be coincident with transient optical events (TLEs), such as red sprites (i.e. a transient luminous event at 55–80 km with the life time of few tens of ms) and elves (i.e. a transient luminous event in the altitude range between 70–90 km with the life time shorter than 1 ms) [14]. Other sources of SR include: (1) the vertical component of intercloud and intracloud discharges; (2) a fluctuating auroral electrojet that flows horizontally within the upper boundary of the cavity at altitudes of approximately 100 km; and (3) ELF whistlers, which are narrow signals believed to originate as plasma drift waves in the dayside magnetosheath and to enter the earth-ionosphere cavity through the polar cusp [14].

There are three noise sources that interferes with SR: (1) Pc 1 geomagnetic pulsations, which have much larger amplitudes than those of SR and can bleed into the lowest frequency 7.5 Hz resonance; (2) medium-scale power line radiation and relatively nearby lightning; and (3) smallscale local or mechanically induced electromagnetic signals [29]. Such noise data can be integrated as part of ELF data in the SR band because their occurrence rates are quite low.

Modern aspects of Schumann resonance studies

Abstract

Springer Link: https://www.sciencedirect.com/science/article/abs/pii/S1364682696000594

Schumann resonance (SR) is an electromagnetic extremely low frequency (ELF) phenomenon that occurs in the natural cavity formed by the Earth's surface and the lower ionosphere. Electromagnetic radiation of global thunderstorms is the source of ELF oscillations. Schumann resonance studies provide valuable information on the properties of the lower ionosphere together with the characteristics of planetary lightning activity. In the present article, modern aspects of the Schumann resonance studies are discussed based on numerical simulations of the ELF radio signals.

The contingency of parameters of human encephalograms and Schumann resonance electromagnetic fields revealed in monitoring studies

Springer Link: https://link.springer.com/article/10.1134/S0006350906030225

Abstract

The contingency of variations in amplitude—frequency parameters of the main modes of extremely-low-frequency resonances of an ionospheric waveguide (Schumann resonances) and changes in human encephalograms in the frequency range of 6–16 Hz has been studied. The results obtained with the use of synchronized monitoring suggest that such contingency, expressed as indices of cross-correlation function, is statistically significant, varying from 0.12 to 0.65 at α = 0.95. It has been established that contingency is largely determined by the current level of solar and geomagnetic activity.