Radio Below 22 kHz – Listening to Earth, Schumann Resonance

Website with numerous articles, schematics, sound samples, technical information on DC- to ultra-ultra low radio and energy below 22 kHz.

The Schumann Resonance refers to a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth’s electromagnetic field spectrum. Discovered in 1952 by physicist Winfried Otto Schumann, these resonances are global electromagnetic resonances, generated and excited by lightning discharges in the cavity formed by the Earth’s surface and the ionosphere.

This natural phenomenon is like the Earth’s heartbeat, with the most prominent frequency being approximately 7.83 Hz, though this can vary slightly from a variety of factors such as seasonal changes to daily variations. The Schumann Resonances are important for the study of the Earth’s electromagnetic environment, and they have been hypothesized to be important for the regulation of human circadian rhythms and overall health, although scientific evidence supporting the latter is still considered speculative and not widely accepted in the scientific community.

The resonances occur because the Earth-ionosphere waveguide acts as a closed waveguide. The limited dimensions of the Earth cause this waveguide to act as a resonant cavity for electromagnetic waves in the ELF band. The cavity is naturally excited by electric currents in lightning. Schumann resonances are the principal background in the electromagnetic spectrum beginning at 3 Hz and extend to 60 Hz, and appear as distinct peaks at extremely low frequencies (ELF) around 7.83 Hz (fundamental), 14.3, 20.8, 27.3, and 33.8 Hz.

In the field of geophysics, these resonances are used to track global lightning activity and to study the properties of the Earth’s electromagnetic environment. While there is interest in investigating the relationship between the Schumann Resonance and biological systems, such as potential impacts on human health and behavior, conclusive scientific evidence is still required to validate these connections.

The study of Schumann resonances encompasses both the natural sciences, including physics and atmospheric science, and speculative inquiries into human health and Earth changes. Despite the fascination it holds for some researchers and the public, it remains a complex and not fully understood aspect of the Earth’s atmosphere.



Listening to radio signals below 22 kHz, particularly those associated with the Schumann Resonance, involves the use of specialized equipment capable of detecting extremely low-frequency electromagnetic waves. Here’s how it works:

1. **Schumann Resonance**: The Schumann Resonance is a set of spectrum peaks in the extremely low-frequency (ELF) portion of the Earth’s electromagnetic field spectrum. It is caused by the resonant frequency of the Earth’s atmosphere, primarily the cavity between the surface of the Earth and the ionosphere. The fundamental frequency of the Schumann Resonance is approximately 7.83 Hz, with higher harmonics at multiples of this frequency.

2. **Detection Equipment**: To listen to radio signals associated with the Schumann Resonance, specialized radio receivers or antennas capable of detecting ELF waves are used. These receivers are typically designed to operate at frequencies below the standard AM radio band (which typically starts at around 530 kHz) and may require custom-built or modified equipment.

3. **Signal Processing**: Once the radio signals associated with the Schumann Resonance are detected, they can be processed and amplified using audio equipment or digital signal processing techniques. This allows for the extraction and analysis of the ELF waves, including the fundamental frequency and its harmonics.

4. **Listening Experience**: Listening to radio signals below 22 kHz, including those associated with the Schumann Resonance, can provide a unique auditory experience. The signals are often described as low, rumbling tones or humming sounds, similar to distant thunder or ocean waves. Some enthusiasts believe that listening to these signals can have calming or meditative effects, although scientific evidence for such claims is limited.

5. **Interpretation and Research**: Scientists and researchers study the Schumann Resonance and other ELF waves for various purposes, including understanding the Earth’s electromagnetic environment, studying atmospheric phenomena, and investigating the potential effects of geomagnetic activity on human health and behavior.

Overall, listening to radio signals below 22 kHz, particularly those associated with the Schumann Resonance, offers a fascinating glimpse into the Earth’s natural electromagnetic rhythms and can be a source of inspiration for scientific inquiry and exploration.

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