REFERENCE RECORD · TOMSK STATE UNIVERSITY · --:--:-- UTC
The Tomsk Schumann resonance spectrogram
The most-cited continuous Schumann resonance record on Earth comes from the Space Observing System (SOS / SOSRFF) at Tomsk State University, Siberia. This page renders that exact format — spectral power density, 0–40 Hz against UTC time — live, interactive and free.
LIVE · TOMSK FORMAT
Spectrogram & sonogram — live view
Frequency 0–40 Hz (vertical) against UTC time (horizontal). The five Schumann modes appear as horizontal ridges. Hover to probe, switch ranges, overlay modes, go fullscreen.
Interactive spectrogram of the extremely-low-frequency Earth-ionosphere cavity, 0 to 40 hertz against UTC time, with the five Schumann modes visible as horizontal ridges.
GUIDE
How to read the Tomsk spectrogram
The axes
Time runs left to right in UTC, one full day per frame. Frequency runs bottom to top from 0 to 40 hertz. Color encodes electromagnetic power density — dark blue is the quiet background floor, bright yellow-to-white is a strongly excited resonance.
The five ridges
Each horizontal band is one Schumann mode: SR1 near 7.8 Hz (the fundamental, Earth's "heartbeat"), then SR2, SR3, SR4 and SR5 near 14.3, 20.8, 27.3 and 33.8 Hz. In this live rendering you can toggle labeled mode guides with the Modes button and probe exact values by hovering.
The daily breathing pattern
The ridges brighten and fade on a daily schedule set by Earth's three great lightning regions — Central Africa (peaking near 14:00 UTC), the Maritime Continent and South America. A vertical bright column means a global lightning surge; slow ridge movement up or down means the ionosphere ceiling is rising or sinking.
What a storm looks like
During geomagnetic storms (high Kp), the ridges can sharpen, split or intensify as solar wind compresses the cavity. Watch this page alongside the live space-weather panel on the main monitor to see the Sun retuning Earth's bell in real time.
About the original station
The reference record is produced by the Space Observing System at Tomsk State University's Geophysical Observatory (sosrff.tsu.ru). Note that this page renders the Tomsk format live and interactive; the resonance series is modelled around published nominal values with realistic drift — because no public global real-time Schumann feed exists — while space weather streams live from NOAA SWPC.
Quick answer
What is the Tomks spectrogram today? The same as always: a full-day spectral record of Earth's ELF cavity. Today's live rendering is in the figure above. Who makes the original? Tomsk State University's Space Observing System, Russia. Where's the full monitor? On the main observatory page — Kp, solar wind, harmonics, solar system and more.
QUESTIONS
Tomsk spectrogram — FAQ
What is the Tomsk Schumann resonance spectrogram?
A continuously updated plot of electromagnetic spectral power density between 0 and 40 Hz, one UTC day per frame, from induction magnetometers at Tomsk State University's Space Observing System (SOSRFF). The five Schumann modes appear as horizontal ridges near 7.8, 14.3, 20.8, 27.3 and 33.8 Hz.
Where is the Tomsk Schumann station?
At the Geophysical Observatory of Tomsk State University, Siberia, Russia — the most-cited continuous Schumann resonance record in the world, often searched for as "tomsk schumann resonance" or via the original site sosrff.tsu.ru.
Is this the original Tomsk feed?
This page renders the Tomsk format live and interactive — mode overlays, range switching, probing, fullscreen. The resonance series is modelled around published nominals (no public global real-time feed exists), while space weather is genuinely live from NOAA SWPC. This is stated openly.