Acquisition · live

What is arriving.

Station 07 receives across the ELF and SLF bands. Below are the current waterfall, the cavity model, and the discrete transients it has chosen to notice. The scientific array is RF receive-only. Public telemetry leaves the instrument building through a shielded, buried fibre link.

Waterfall · frequency → (log) · time ↓ · ELF–SLF · 3–300 Hz 300 s window · published 1 Hz · uncalibrated since 1974

Power+3 → +20 dB over local noise floor At floor Flagged carrier · labelled on axis Sealed · frequency withheld Cavity mode · global, no bearing

Table view — features presently tracked (equivalent to the plot)
Frequency	Kind	Linewidth	Power	State	Bearing
7.83 Hz	Cavity mode 1	1.96 Hz	+12.5 dB	Continuous	Global / indeterminate
14.30 Hz	Cavity mode 2	3.18 Hz	+9.5 dB	Continuous	Global / indeterminate
20.80 Hz	Cavity mode 3	4.16 Hz	+7.5 dB	Continuous	Global / indeterminate
27.30 Hz	Cavity mode 4	5.06 Hz	+5.8 dB	Continuous	Global / indeterminate
33.80 Hz	Cavity mode 5	5.83 Hz	+4.2 dB	Continuous	Global / indeterminate
39.80 Hz	Cavity mode 6	6.63 Hz	+3.0 dB	Continuous	Global / indeterminate
50.000 Hz	Mains harmonic	<0.01 Hz	+16.0 dB	Flagged	Local / not resolved
150.000 Hz	Mains harmonic	<0.01 Hz	+13.0 dB	Flagged	Local / not resolved
250.000 Hz	Mains harmonic	<0.01 Hz	+8.5 dB	Unflagged	Local / not resolved
████ Hz	Withheld	██████	█████	Sealed	████████

Vertical band = continuous mode. Horizontal row = broadband transient. Hairline = mains harmonic. Nothing in this band is a straight diagonal.

Spatial coherence · live

The field occupies a cavity.

The Earth and lower ionosphere form the receiving boundary. Distributed natural excitation populates the cavity; Station 07 samples local electric and magnetic components.

Distributed field fronts → cavity modes → local E/B → coherence → public Q.

Discrete events presently noticed

Arrival azimuth	Frequency	State	Signature

Note

Continuous modes do not carry a bearing.

A discrete transient is logged when its coherence with the background exceeds a threshold the station sets for itself and revises without notice. Arrival azimuth is derived from orthogonal magnetic components and an electric sense channel, with uncertainty. Continuous cavity peaks remain global / indeterminate.

“One transient has returned every night since the log began. Its azimuth is not on this list. The station has asked that it not be.”
— margin of Log 07, undated

Continue to the open register ↗ · or return to the readout.