On the group velocity of whistling atmosphericsстатья
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Дата последнего поиска статьи во внешних источниках: 3 февраля 2022 г.
Аннотация:The dynamic spectrum of a whistling atmosphericis a signal of falling tone, and the group delaytime of the signal as a function of frequency isformed as a result of propagation of a broadband pulse in a medium (magnetospheric plasma) with a quadratic dispersion law. In this paper, we show that for quadratic dispersion the group velocity is invariant under Galilean transformations. This means that, contrary to expectations, the group velocity is paradoxically independent of the velocity of the medium relative to the observer. Ageneral invariance condition is found in the form of a differential equation. To explain the paradox, we introduce the concept of the dynamic spectrum of Green’s function of the path of propagation of electromagnetic waves from a pulse source (lightning discharge in the case of a whistling atmospheric) in a dispersive medium.We emphasize the importance of taking into accountthe motion of plasma in the experimental and theoretical study of electromagnetic wave phenomena in near-Earth space.