VLF: Trimpi receiver
Trimpi receiver

A narrow-band receiver is operated at Halley, measuring the phase and amplitude of selected VLF transmissions. The purpose is to detect lightning-induced electron precipitation (LEP) into the ionosphere by means of the transient perturbations caused to sub-ionospheric VLF propagation (the Trimpi effect) (Smith, 1996). The original OPAL (Omega Phase and Amplitude Logger) design of receiver described by Smith and Cotton (1990) was superseded by the OMSK (Omega and MSK) which could also receiver MSK transmissions, with a resulting improvement in time resolution and signal-noise ratio (Friedel et al., 1993; Smith et al., 1993). A further enhancement (OmniPAL), designed by the University of Otago, New Zealand, is due for deployment in 1997.

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