ON THE GROUP VELOCITY OF WHISTLING ATMOSPHERICS
Journal Title: Solar-Terrestrial Physics - Year 2021, Vol 7, Issue 4
Abstract
The dynamic spectrum of a whistling atmospheric is a signal of falling tone, and the group delay time of the signal as a function of frequency is formed 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. A general 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 account the motion of plasma in the experimental and theoretical study of electromagnetic wave phenomena in near-Earth space.
Authors and Affiliations
Guglielmi A. V. , Klain B. I. , Potapov A. S.
Keywords
Related Articles
- EP ID EP700039
- DOI 10.12737/stp-74202106
- Views 131
- Downloads 0
MORPHOLOGY AND DIAGNOSTIC POTENTIAL OF THE IONOSPHERIC ALFVÉN RESONATOR
The layering of the ionosphere leads to the formation of resonators and waveguides of various kinds. One of the most well-known is the ionospheric Alfvén resonator (IAR) whose radiation can be observed both on Earth’s su...
ALFVÉN WAVES IN THE MAGNETOSPHERE GENERATED BY SHOCK WAVE/PLASMAPAUSE INTERACTION
We study Alfvén waves generated in the magnetosphere during the passage of an interplanetary shock wave. After shock wave passage, the oscillations with typical Alfvén wave dispersion have been detected in spacecraft obs...
REVIEW AND COMPARISON OF MHD WAVE CHARACTERISTICS AT THE SUN AND IN EARTH’S MAGNETOSPHERE
Magnetohydrodynamic (MHD) waves play a crucial role in the plasma processes of stellar atmospheres and planetary magnetospheres. Wave phenomena in both media are known to have similarities and unique traits typical of ea...
Spectral analysis of IAR oscillations to determine the value and variability of the peak electron density NmF2
This methodical paper explores the possibility of estimating the peak electron density of the F2-region of the ionosphere (NmF2) under different conditions, using data on the frequency of spectral bands (harmonics) of th...
CLASSIFICATION OF MAGNETOSPHERIC RESPONSES TO INTERACTION WITH DIAMAGNETIC STRUCTURES OF SLOW SOLAR WIND
We propose a possible classification of the responses of the magnetosphere to the interaction with diamagnetic structures (DS), which form the basis of the slow solar wind. The main determinants of the classification are...