Abstract
At termination of an amplified and saturated (Bsat) Vlf pulse from Siple Station, Antarctica, a band‐limited (50–500 Hz range) impulse (BLI) is generated which in turn triggers a narrowband emission, of about the same amplitude, that starts at about 50–150 Hz above the frequency of Bsat, called the positive frequency offset (PFO). The BLI creates the PFO by reducing the parallel velocities of existing phase‐bunched cyclotron resonant electrons that form the source currents (J⟂) of the stimulated radiation. The PFO is proportional to the magnetic field intensity BBLI of the BLI. Since BBLI ≈ Bsat the PFO then becomes a measure of the saturated field Bsat. An example for L = 4 and a pitch angle of 60°, gives Bsat ≅ 5pT, in good agreement with previous estimates of Bsat.
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