The Variation of Pi 2 Micropulsation Waveform with Time

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Abstract
Pi 2 micropulsations observed ‘simultaneously’ at two widely separated low‐latitude stations: M'Bour, Senegal, in West Africa, and Makerere, Uganda, in East Africa have been compared. The variation in the waveforms has been measured in terms of an average damping coefficient and the number of excursions taken for events to reach their peak amplitude. The differences in the waveforms are discussed in terms of dispersion varying with distance from the Pi 2 source and the damping coefficient varying with time. Shorter period activity has been noted in association with some Pi 2 events and an estimate of the relative apparent phase velocity of the higher‐frequency component has been made.

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