Modification of the Earth's Ionosphere by Very-low-frequency Transmitters PDF Download
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Author: Juan Valentin Rodriguez
Publisher:
ISBN:
Category : D region
Languages : en
Pages : 392
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Author: Juan Valentin Rodriguez
Publisher:
ISBN:
Category : D region
Languages : en
Pages : 392
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Book Description
Author: Kevin Graf
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The effects of ground-based very low frequency (VLF) transmitters on the ionosphere and magnetosphere are investigated. VLF transmitters, used primarily for Naval communications with submarines, are also capable of heating the ionosphere and inducing the precipitation of energetic electrons from the Earth's radiation belts. Controlled modulation experiments are performed with the 21.4 kHz, 424 kW VLF transmitter NPM in Lualualei, Hawaii, and physical effects of the NPM transmissions are studied with sub-ionospherically propagating VLF probe signals. Observed perturbations to the probe signal are not consistent with expectations from transmitter-induced electron precipitation nor to off-path scattering from a concentrated heating region near the transmitter but rather appear to be the result of scattering from extended lateral heating of the ionosphere by the NPM transmitter. A large-scale computational modeling framework confirms theoretically that this form of ionospheric heating can account for the observed probe signal modulations, establishing that the lateral extent of ionospheric heating due to VLF transmitters is several thousand kilometers, significantly greater than previously recognized. The trans-ionospheric propagation of VLF waves is also investigated as updated attenuation estimates are provided for multiple scenarios.
Author: Vladimir Bychkov
Publisher: Springer Science & Business Media
ISBN: 9048132126
Category : Science
Languages : en
Pages : 388
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Book Description
From July 7 to 12, 2008 in Zelenogradsk, a cosy resort on the bank of the Baltic Sea near Kaliningrad in Russia, the 1st International Conference “Atmosphere, Ionosphere, Safety (AIS-2008)” has been carried out. The State Russian University of I. Kant, Semenov Institute of chemical physics of the Russian Academy of Sciences, Pushkov Institute of terrestrial magnetism and radio-waves propagation of the Russian Academy of Sciences, and Russian Committee on Ball Lightning (BL) have acted as organizers of the conference. Financial support was made by Russian Fund of Fundamental Research Project N. 08-03-06041 and European Of?ce of Aerospace Research and Development Grant award FA8655-08-1-5052. The International conference “Atmosphere, Ionosphere, Safety” (AIS-2008) was devoted to (i) the analysis of the atmosphere–ionosphere response on natural and man-made processes, the reasons of occurrence of the various accompanying geophysical phenomena, and an estimation of possible consequences of their in?uence on the person and technological systems; (ii) the study of the monitoring possibility and search of the ways for the risk level decrease. Discussion of the physical and chemical processes accompanying the observable geophysical p- nomena was undertaken. One can see from a list of the Conference sections that questions of safety took only rather modest place, so main topics of the Conference became discussion of processes taking place in the atmosphere, ionosphere and methods of monitoring these processes.
Author: O. A. Molchanov
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Author: J. Ralph Johler
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 206
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Author: Kenneth Davies
Publisher: IET
ISBN: 9780863411861
Category : Science
Languages : en
Pages : 612
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Book Description
This introductory text replaces two earlier publications (Davies 1965, 1969). Among the topics: characteristics of waves and plasma, the solar-terrestrial system, the Appleton formula, radio soundings of the ionosphere, morphology of the ionosphere, oblique propagation, importance of amplitude and phase, earth-space propagation. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Amir Behrooz Behroozi Toosi
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 350
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Author: James R. Wait
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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An approximate analysis is given for VLF propagation in the earth-ionosphere waveguide of variable height. The height changes are not restricted to points along the great circle path connecting the transmitter and receiver. By choosing a simple example, we show that ionospheric perturbations lying within the first Fresnel zone are most effective in modifying the phase of the received signal. This paper is a sequel to an earlier one published in the Journal in 1961 about ionospheric depressions that were infinite in their transverse dimension. (Author).
Author: Jyrki Manninen
Publisher:
ISBN: 9789514260476
Category : ELF electromagnetic fields
Languages : en
Pages : 177
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 874
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