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Trimpi plot (narrow band). The amplitude and phase are
shown for four VLF transmitters: NPM (Hawaii)
23.4 kHz, NAA (Maine) 24.0 kHz, Omega Hawaii and Omega
Argentina. For the Omega stations, the
unique frequency is shown (11.8 kHz and 12.9 kHz
respectively). Amplitude is plotted in dB and phase in
degrees, as indicated by the scales at the right of the
plot. The asymmetrical Trimpi events (rapid onset, slow
decay) are clearly seen throughout the ten-minute interval
(0850-0900UT 2 March 1992). See
Lev Tov et
al., 1996 for further explanation.
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