Čerenkov radiation within the Earth's upper atmosphere
TL;DR: A brief review of Cerenkov radiation within the upper atmospheric plasma has been presented in this article, where the results of analysis about the nature and characteristics of VLF hisses in terms of incoherent Cererkov radiation are given in a concise manner.
Abstract: A brief review of Cerenkov radiation within the upper atmospheric plasma has been presented. Different attempts in this context are systematically discussed. The results of analysis about the nature and characteristics of VLF hisses in terms of incoherent Cerenkov radiation are given in a concise manner. The occurrence of resonance cone has also been reported.
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26 Dec 1962
TL;DR: In this article, the authors investigated the radiation from a point charge moving uniformly in a plasma, when the charge is moving in the direction of an external magnetic field, and obtained two sets of values of these parameters, the frequency and the angular spectrum of the emitted radiation.
Abstract: The radiation from a point charge moving uniformly in a plasma is investigated when the charge is moving in the direction of an external magnetic field. In general, there are two modes, for each of which all the components of the electric and magnetic field are present. The two parameters of interest in this problem are the ratio of the velocity of the charges to the free-space velocity of electromagnetic waves, and the ratio of the gyromagnetic frequency to the plasma frequency of the electrons. For two sets of values of these parameters, the frequency and the angular spectrum of the emitted radiation are obtained. In certain cases, as many as three Cherenkov rays are found to propagate in the same direction; these multiple-rays, however, correspond to different frequency components and to different modes of propagation. The motivation for this investigation is indicated briefly. (auth)
13 citations
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22 citations
TL;DR: The generalized Frank & Tamm's formula for the total energy radiated as Cerenkov radiation by a swiftly moving charged particle in a medium of dielectric constant and permeability was derived employing the invariance of the phenomenological electrodynamic equations of Maxwell as mentioned in this paper.
Abstract: The generalized Frank & Tamm's formula for the total energy radiated as Cerenkov radiation by a swiftly moving charged particle in a medium of dielectric constant $\epsilon $ and permeability $\mu $ has been derived employing the invariance of the phenomenological electrodynamic equations of Maxwell. The scheme is self-consistent, and the idea of the indetectability of the ether wind is contained in it. It is found that the Cerenkov radiation is $\mu $ times larger than that predicted by the Frank & Tamm's formula for $\mu $ = 1. Experiments are suggested to detect strong Cerenkov radiation in highly permeable mediums.
21 citations
TL;DR: In this paper, the theory of the loss of energy of a non-accelerated particle in a material medium is investigated using classical electrodynamics. But the results of Fermi, Halpern and Hall, Wick and A. Bohr are generalized and further extended.
Abstract: The theory of the loss of energy of a non accelerated charged particle in a material medium is investigated, using classical electrodynamics. Special attention is given to the mechanism of the loss. The results of Fermi, Halpern and Hall, Wick and A. Bohr are generalized and further extended. The points of view of action at a distance (Bohr) and field theory (Fermi) are discussed and compared. The mechanism of the emission of Cerenkov radiation is examined and the relations with the emission of acceleration radiation analysed.
19 citations
18 citations
18 citations