What is schumann resonance?

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Schumann Resonance

The Schumann Resonances are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth's electromagnetic radiation spectrum. They are global electromagnetic resonances, excited by lightning discharges in the cavity formed by the Earth's surface and the ionosphere.

• Origin and Mechanism: Schumann resonances occur because the space between the Earth's surface and the ionosphere acts as a resonant cavity for electromagnetic waves in the ELF band. This cavity naturally resonates at a number of frequencies, which are primarily determined by the size of the Earth. These electromagnetic waves are excited by natural sources, predominantly lightning strikes around the world. The main frequency, or fundamental mode, is approximately 7.83 Hz.

• Frequencies: There are multiple Schumann resonance frequencies, with the fundamental mode being around 7.83 Hz. Higher modes occur at approximately 14.3 Hz, 20.8 Hz, 27.3 Hz, and 33.8 Hz, and so on. The exact frequencies vary slightly because the ionosphere isn't perfectly uniform.

• Factors Affecting Schumann Resonance: Various factors influence the Schumann Resonance, including solar activity and ionospheric variations. Increases in solar flares and geomagnetic activity can influence the strength and frequency of the resonances. Global lightning activity, particularly in areas like the Amazon basin, Central Africa, and Southeast Asia, also plays a significant role.

• Monitoring and Measurement: Scientists monitor Schumann resonances using ground-based sensors located at various points around the world. These sensors detect the ELF electromagnetic waves and allow researchers to study variations in the resonant frequencies and intensities.

• Potential Applications and Significance: Some researchers believe that changes in Schumann resonance might have effects on human health and well-being, although this is a controversial topic and requires further scientific investigation. Its more established significance is in atmospheric studies and monitoring global lightning activity.