REFERENCE — ACADEMY
What is the Schumann resonance?
The short answer: a set of planetary-scale electromagnetic standing waves in the gap between Earth's surface and the ionosphere, set ringing by global lightning. The fundamental tone — the planet's lowest natural frequency — sits at 7.83 Hz.
A bell the size of a planet
Picture the space between the ground and the lower edge of the ionosphere (roughly 80–100 km up) as a resonating cavity — like the body of a guitar, or a bell whose walls are the Earth below and conducting plasma above. About 2,000 thunderstorms are active at any moment, and their ~44–50 lightning strikes per second inject electromagnetic bursts into this cavity at extremely low frequencies (ELF).
Waves at just the right length wrap around the planet and reinforce themselves: the round-the-world path is about 40,000 km, which matches the wavelength of an approximately 7.5 Hz oscillation. Energy at these frequencies cannot escape — it diffracts around the globe with very little loss. The result is a faint but permanent planetary hum, first predicted by Winfried Otto Schumann in 1952 and first measured by his student Herbert König.
The five modes: SR1 to SR5
A bell rarely rings at one note, and neither does Earth. The resonance appears as a series of modes:
| Mode | Nominal frequency | Wavelength | Meaning |
|---|---|---|---|
| SR1 | 7.83 Hz | ≈ 38,300 km | The fundamental — Earth's "heartbeat" |
| SR2 | 14.3 Hz | ≈ 21,000 km | First overtone |
| SR3 | 20.8 Hz | ≈ 14,400 km | Second overtone |
| SR4 | 27.3 Hz | ≈ 11,000 km | Third overtone |
| SR5 | 33.8 Hz | ≈ 8,880 km | Fourth overtone |
Track all five live on the main observatory page, or read the full frequency reference table.
Why the frequency drifts
The pitch of any cavity depends on its size. The ionosphere's effective ceiling rises and sinks with solar X-rays, cosmic rays, seasons and the day/night cycle. A taller nighttime cavity lowers the frequency slightly; a compressed, geomagnetically storm-time ionosphere can sharpen and amplify it. That is why SR1 wanders between roughly 7.2 and 8.1 Hz in slow, breathing waves — visible in real time in the daily sonogram on the home page.
How it is measured — and by whom
Reference stations in Greenland, Antarctica, and Sodankylä (Finland) bury induction-coil magnetometers in magnetically quiet terrain. A single station effectively hears the whole planet. The most-cited continuous record is the sonogram published by the Space Observing System (SOS) at Tomsk State University, Russia. There is no single official global real-time feed; published series are calibrated composites — which is exactly what this observatory models around true nominal values, openly stated.
Biology: what the science actually says
Studies from Bise (1978) to Kübler (2019) find weak but reproducible cortical responses to 7.8–8 Hz fields — at intensities thousands of times stronger than the natural ~1 pT background. At natural levels, the signal appears to be below the threshold of human perception. Claims that 7.83 Hz "heals," entrains sleep, or "activates DNA" are not supported by evidence. The honest position: it is real, global, measurable — and genuinely fascinating without mysticism.
Why space agencies care
Any world with lightning and an ionosphere should ring: Venus, Mars, Titan, even exoplanets. Detecting a Schumann resonance from a single ELF antenna would reveal lightning activity and ionosphere height in one measurement — a genuine remote-sensing tool for planetary science, proposed for future Mars and Titan landers.
Quick answers
What is the Schumann resonance today? The same physical phenomenon as always — today's live SR1 value, amplitude and activity rating are on the live monitor. Is it dangerous? No — it is a natural electromagnetic background that has existed since Earth had storms. Who discovered it? Winfried Otto Schumann predicted it in 1952; Herbert König confirmed it.