The Schumann Resonance

What is the Schumann resonance?

The Schumann resonance is a set of standing electromagnetic waves that ring in the thin shell of space between the Earth’s surface and the ionosphere — the electrically charged upper atmosphere that begins roughly 60–100 km overhead. Both the ground and the ionosphere conduct electricity reasonably well, while the air in between does not. That sandwich forms a natural cavity, and like any resonant cavity — an organ pipe, a wine glass, a guitar body — it favours certain frequencies.

For the Earth–ionosphere cavity, the lowest and strongest of those favoured tones is about 7.83 Hz. It is an extremely-low-frequency (ELF) radio signal, not a sound: at 7.83 Hz it sits far below the ~20 Hz floor of human hearing, and it is a wave in the electromagnetic field rather than a wave of air pressure. You cannot hear it or feel it directly — but sensitive antennas and magnetometers pick it out clearly. The spectrogram on our live Schumann resonance homepage shows it as recorded by a monitoring station in Tomsk, Russia (Tomsk live sonogram), and our guide explains how to read that chart.

Because it is a steady, planet-wide pulse that has existed for as long as the Earth has had an atmosphere and lightning, the resonance is often nicknamed the “heartbeat of the Earth.” The name is poetic, not literal — there is no biology in it — but it captures the idea of a constant background rhythm of the whole planet.

History: Schumann’s 1952 prediction

The resonance is named after Winfried Otto Schumann (1888–1974), a German physicist at the Technical University of Munich. In 1952, working from Maxwell’s equations and the known geometry of the Earth and ionosphere, Schumann calculated that an ideal, lossless cavity of the Earth’s size should ring at about 11 Hz in its lowest mode (Schumann 1952). The real cavity loses energy, which is why the measured fundamental is lower, near 7.8 Hz (Wikipedia). He published the prediction in a pair of papers that year.

Prediction is not proof. In 1954 Schumann and Herbert König published early observations of lightning signals at the lowest frequencies (Schumann and König 1954), but the analysis tools of the time could not yet pull the resonance peaks cleanly out of the background noise. The first clear measurement came in 1960, when the American researchers M. Balser and C. A. Wagner at MIT Lincoln Laboratory reported the peaks, including the higher modes, in Nature (Balser and Wagner 1960; history in Besser 2007).

The underlying idea was not entirely new in 1952. The notion that the Earth–ionosphere system could behave as a giant resonator had been floated decades earlier — the Irish physicist George Francis FitzGerald sketched something similar in the 1890s, and Nikola Tesla conducted experiments around the turn of the century that touched on Earth-scale electrical resonance. Schumann was the one who put the mathematics on a firm footing and tied it to a specific, testable frequency. For a deeper dive into the people and papers, see our history of the discovery.

The physics: Earth’s resonant cavity

Here is the mechanism in plain terms. Around the planet, lightning strikes the Earth roughly 50 times every second — a more or less continuous global drumbeat of electrical discharges. Each strike radiates a broadband burst of electromagnetic energy, including a great deal of energy at extremely low frequencies.

Those ELF waves are too long to escape upward through the ionosphere or downward into the ground, so they propagate sideways, hugging the curve of the planet inside the Earth–ionosphere waveguide. A wave travelling all the way around the globe arrives back where it started after circling roughly 40,000 km. When the circumference of the Earth is close to a whole number of wavelengths, the returning wave arrives in step with newly launched waves and they reinforce one another — constructive interference. That reinforcement is the resonance.

Work out the wavelength that fits the Earth’s circumference once, travelling at close to the speed of light, and you land at about 7.5 Hz, in the same range as the measured fundamental of about 7.83 Hz. Fit two wavelengths around the globe and you get the second mode, three wavelengths the third, and so on. That is why the resonance appears not as a single tone but as a series of peaks climbing up the spectrum. This picture is a simplification: Schumann’s full calculation for an ideal cavity gives about 10.6 Hz for the lowest mode (Tomsk station), and energy losses in the real cavity pull the measured value down to about 7.8 Hz (Wikipedia).

The two “walls” of this cavity are not perfect mirrors, which is why the resonance is broad rather than razor-sharp, and why the higher modes get progressively weaker. The lower boundary is the conductive ground and oceans; the upper boundary is the ionosphere, whose height and conductivity shift with sunlight, season and solar activity — which, as we will see, is exactly why the frequency wanders.

The harmonics above 7.83 Hz

The 7.83 Hz fundamental is only the first of a family. The higher modes of the cavity appear at roughly 14, 20, 26 to 27 and 32 to 33 Hz, with still-higher peaks continuing at roughly 6 Hz spacing until they fade into background noise. These are often called the Schumann harmonics, although they are not exact integer multiples of 7.83 Hz. On a sphere the mode frequencies follow a square-root pattern rather than simple multiples, and losses in the real cavity shift them further (Wikipedia).

We give ranges because there is no single official table. Each study measures slightly different values depending on the station, the season and the method. Balser and Wagner found peaks near 8, 14.1, 20.3, 26.4 and 32.5 Hz (Tomsk station). A review led by NASA researchers reports that the C/NOFS satellite saw 7.9, 14.1, 20.6, 26.8 and 32.9 Hz, matching ground measurements (Simões et al. 2011). Seven years of data from Eskdalemuir in Scotland give about 8, 14, 20, 27 and 32 Hz (Musur and Beggan 2019), and the Tomsk station’s own averages from 1997 to 2023 are 7.75, 14.17, 20.23 and 25.88 Hz for the first four modes. You will often see 14.3, 20.8, 27.3 and 33.8 Hz quoted online, and this page used those numbers until September 2026. We did not find them in any of the measured series we checked, so we now give the ranges above.

A curiosity that gets a lot of attention: several of these modes fall inside the bands used to describe human brainwaves. The second mode near 14 Hz, for instance, sits near the border between the alpha and beta bands. That numerical overlap is real and interesting, but it does not by itself prove the brain “tunes” to the resonance. We unpack that claim carefully in Schumann resonance vs. brainwaves.

Why 7.83 Hz is an average, not a constant

You will see “7.83 Hz” quoted everywhere as the Schumann frequency, and it is a fine round number to remember. But the value you would read off a real magnetometer at any given moment is not fixed. In practice the fundamental peak drifts between roughly 7.4 Hz and 8.2 Hz, and its amplitude (how strong the signal is) varies far more than that.

The frequency wanders because the cavity itself changes. The ionosphere — the upper wall — rises and lowers and changes conductivity between day and night and across the seasons, subtly resizing the cavity. At the Eskdalemuir observatory in Scotland, for example, the fundamental averages above 8 Hz in winter and below 7.9 Hz in summer (Musur and Beggan 2019). The amplitude tracks global lightning, which peaks in the afternoon over the great tropical thunderstorm regions of Africa, Southeast Asia and South America, so the resonance has a daily rhythm tied to where it is mid-afternoon on the planet. Measured intensity peaks near 08:00, 14:00 and 20:00 UT, when the Asian, African and American thunderstorm centres are most active (Musur and Beggan 2019). Because lightning increases with temperature, the resonance has even been proposed as a global tropical thermometer (Williams 1992).

This is why claims that “the Schumann resonance has spiked to 30 or 40 Hz” should be read with care. Short bursts of high amplitude do happen and look dramatic on a spectrogram, but the fundamental frequency stays anchored near 7.83 Hz — it has not migrated upward over time. What moves is intensity, not the home note. Our guide on how to read the Schumann resonance chart shows what those bright bursts are, and our methodology page explains exactly how we read the live data and where it comes from.

How geomagnetic storms shift it

The Sun is the other big influence. Solar flares and coronal mass ejections fling charged particles toward Earth; when they arrive, they compress and energise the upper atmosphere and trigger a geomagnetic storm. Because the ionosphere is one wall of the Schumann cavity, a storm that disturbs the ionosphere also nudges the resonance — typically perturbing its amplitude and slightly shifting the peak frequencies and the day–night pattern.

The standard yardstick for that solar disturbance is the Kp index, a 0–9 scale of how unsettled the Earth’s magnetic field is (NOAA SWPC). When it reaches Kp 5 the event is classed as a storm on the G1–G5 geomagnetic storm scale, and the same disturbance that ripples through the Schumann data is the one that pushes the aurora toward lower latitudes. Watching the Kp index, the storm scale and the spectrogram side by side is the clearest way to see the Sun’s fingerprints on the resonance.

Effects on technology during strong storms are well documented — GPS accuracy degrades, high-frequency radio fades, and in extreme cases power grids feel the strain. Effects on the resonance are physical and measurable too. Whether any of this translates into effects on people is the harder, more contested question — which is where the next section is deliberately careful.

The honest research picture: humans & 7.83 Hz

This is the area most loaded with hype, so it is worth stating the honest position plainly. There is a genuine, peer-reviewed body of research looking for links between geomagnetic and Schumann-resonance activity and human physiology — heart-rate variability (HRV), sleep quality, mood and certain clinical events. The most-cited bodies of work include the HeartMath Institute’s Global Coherence Initiative (GCI), the chronobiology research associated with Franz Halberg and colleagues, and a scattering of studies indexed in mainstream databases such as PubMed / NIH.

What that literature actually supports is modest: weak but statistically measurable correlations — for example, small shifts in average HRV across populations that line up with geomagnetic activity. Correlations of this kind are real findings, but they are not the same as proof that the Schumann resonance causes a given symptom in a given person. The effect sizes are small, the mechanisms are still debated, sample sizes are often limited, and confounding factors (weather, season, behaviour) are hard to rule out.

Our own stance is to track the community-reported patterns — the symptoms people log during high-activity windows — alongside the hard data, without overclaiming a causal link. You can read our full position in the “is it scientifically proven?” explainer and the consciousness & biology deep-dive.

How to track the Schumann resonance today

If you want the current state rather than the theory, that is what the rest of this site is for. The live Schumann resonance homepage shows a real-time spectrogram of the 7.83 Hz band from the Tomsk monitoring station, next to the current Kp index, solar X-ray flux and a 3-day space-weather forecast, so you can see at a glance whether the field is calm or stirred up right now. New to spectrograms? Start with how to read the chart: what the axes mean, why the colours are not picotesla, and what the white stripes are.

Want to go deeper on a specific angle? Read the plain-English explanation, how the resonance is measured, or why 7.83 Hz earned the “heartbeat” name. The full blog archive has 80+ articles on the topic.