SR17.83 Hz
Frequency7.83Hz
Amplitude12.4pT
Quality Q5.2
Earth–Ionosphere Cavity · Continuous Record · 21 Jun 2026 · 21:17 UTC
The planet is breathing.
7.83Hz
Forty-four lightning strikes a second excite the cavity between the conducting ground and the ionosphere. Earth rings at 7.83 Hz — watch every harmonic, chart, and the Tomsk spectrogram, live.
The five standing waves
Harmonics SR1–SR5.
SR214.30 Hz
Frequency14.30Hz
Amplitude6.8pT
Quality Q4.6
SR320.80 Hz
Frequency20.80Hz
Amplitude4.2pT
Quality Q4.0
SR427.30 Hz
Frequency27.30Hz
Amplitude2.6pT
Quality Q3.5
SR533.80 Hz
Frequency33.80Hz
Amplitude1.4pT
Quality Q3.0
Rolling 24 hours
Frequency & amplitude trends.
Frequency drift
HzSR1 fundamental · 24h7.80 – 7.86
Amplitude
pTPeak power · 24hpeak —
Spectrum & quality
Power spectrum & Q-factor.
Live power spectrum
0–40 HzFive Gaussian peaksSR1–SR5
Quality factor Q
per modePeak sharpnessSR1 → SR5
24-hour envelope
Power timeline.
Amplitude envelope · last 24h
quietactiveintense
CURRENT12.4 pT
PEAK 24h—
MEAN—
ACTIVITYquiet
Space weather
Geomagnetic & solar conditions.
Kp index
planetary2.0quiet
0123456789
Solar wind
ACE / DSCOVRSpeed1472km/s
Density5.2p/cm³
Bt field4.1nT
Temp120KK
X-ray flux
GOESB2.4background
ABCMX
Quiet solar background. No significant flares.
Raw signal · Tomsk station
The spectrogram.
403020100 Hz
TOMSK · SOS
−24h−18h−12h−6hNOW
POWER
quietintense
What you are seeing
The science of the hum.
The Schumann resonance is the planet's base electromagnetic frequency — a global standing wave set up by lightning in the cavity between the Earth's surface and the ionosphere.
Predicted by physicist Winfried Otto Schumann in 1952 and first detected in the 1960s, its fundamental mode resonates near 7.83 Hz. The cavity's geometry fixes the pitch; storms, the Sun and the turning day shape its loudness.
Reading the data
- Frequency — the pitch of each mode. Extraordinarily stable for SR1 (~7.83 Hz).
- Amplitude (pT) — how loud each mode is. Spikes with global lightning.
- Quality factor Q — peak sharpness. Higher Q means a cleaner, longer-ringing resonance.
- Kp index — planetary geomagnetic disturbance, 0 (quiet) to 9 (storm).
Where the signal comes from
The spectrogram is the raw electromagnetic record of the Tomsk Space Observing System — vertical axis is frequency (0–40 Hz), horizontal is UTC time, colour is power.
Questions
Frequently asked.
What is the Schumann resonance?
A set of global electromagnetic resonances excited by lightning in the cavity formed by Earth's surface and the ionosphere. The base frequency is 7.83 Hz.
What are the five harmonics?
SR1 (7.83 Hz), SR2 (14.3 Hz), SR3 (20.8 Hz), SR4 (27.3 Hz) and SR5 (33.8 Hz). Each has its own amplitude and quality factor, shown in the harmonics grid.
What is the quality factor (Q)?
Q measures how sharp each resonance peak is. The Schumann fundamental typically has Q ≈ 5–6, decreasing for higher modes.
Can I really hear it?
The true 7.83 Hz is below human hearing. ATLAS pitches the fundamental and its harmonics up by octaves so the chord of the planet becomes audible.
Where does the live data come from?
The spectrogram is sourced from the Tomsk Space Observing System. Frequency, amplitude and harmonic values refresh continuously.