Spectrogram Archive
Browse Earth's electromagnetic history — one day at a time.
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How to Read Schumann Resonance Charts
A Schumann Resonance chart (spectrogram) is a visual record of electromagnetic waves bouncing between Earth's surface and the ionosphere. The fundamental frequency sits around 7.83 Hz, with harmonics at roughly 14.3, 20.8, 27.3, and 33.8 Hz. On a spectrogram, these show up as horizontal bands. When the bands brighten or shift, something interesting is happening in the ionosphere — often linked to solar wind, geomagnetic storms, or lightning activity.
Bright vertical streaks across multiple frequencies typically indicate a burst of global lightning activity or a sudden ionospheric disturbance. A steady, clean pattern with distinct bands suggests calm conditions. If the bands blur together or shift upward, that can point to increased geomagnetic activity — the kind of days where sensitive people sometimes report headaches, restlessness, or vivid dreams.
This archive stores every reading we collect from three independent stations. Cross-referencing multiple stations matters because local electrical interference can make a single station's data misleading. When all three stations agree, you can trust the reading. Browse day by day, spot patterns over weeks, or compare how a geomagnetic storm looked from Siberia versus the Mediterranean. Tomsk, Cumiana, ETNA. Live Graph →
