- Definition: Extreme Low Frequencies are electromagnetic waves, generated by athmospheric discharges in weather fronts (sferics) or by electrotechnical events (technics). In the range of neuronal frequencies (EEG, EMG), they are considered to be the cause of weather disease and the trigger of the biological clock.
- Instrumentation: ELFes are catched by an frame antenna (on the roof of the trawlhouse), selected, amplified and pulses counted per second over a certain amplitude.
- Evaluation: The numerical material is examined for nonlinear chaotic regularities by means of the theorem of takens. The fluctuation of this regularity is looked out for.