Live Demo — Synthetic Magnetometer
No hardware, database, or API key required. Generated in your browser to mimic a live NextMAG-format feed, with a real FFT spectral engine.
Total field (Bt)
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dB/dt
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Dominant freq
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GIC risk
0normal
FFT spectrum — magnitude (dB) vs frequency (Hz)noise floor —
Toggle Grid EMI to see the mains fundamental and its harmonics appear; switch 50/60 Hz to watch the comb shift. "Inject spike" adds a broadband transient; "storm" raises the noise floor.
Spectrogram — frequency (vertical, 0–320 Hz) over time (scrolling →)
Horizontal bands are the mains harmonics; toggling 50↔60 Hz or storm mode shifts/raises them in real time.
Total field (nT)
Rate of change dB/dt (nT/min)