<i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere

<i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere

UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density...

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Main Authors: S. M. Grach, V. M. Fridman, L. M. Lifshits, T. S. Podstrigach, E. N. Sergeev, S. D. Snegirev
Format: Article
Language:English
Published: Copernicus Publications 2002-10-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/20/1687/2002/angeo-20-1687-2002.pdf
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spelling doaj-6e8ebb0e4635443b903518aa5e2e7ef72020-11-25T00:32:41ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762002-10-01201687169110.5194/angeo-20-1687-2002<i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphereS. M. Grach0S. M. Grach1V. M. Fridman2L. M. Lifshits3T. S. Podstrigach4E. N. Sergeev5S. D. Snegirev6State University of Nizhny Novgorod, Gagarina av. 23, Nizhny Novgorod, 603950, RussiaCorrespondence to: S. M. Grach (sg@nirfi.sci-nnov.ru)Radiophysical Research Institute, B. Pecherskaya 25, Nizhny Novgorod, 603950, RussiaState University of Nizhny Novgorod, Gagarina av. 23, Nizhny Novgorod, 603950, RussiaRadiophysical Research Institute, B. Pecherskaya 25, Nizhny Novgorod, 603950, RussiaRadiophysical Research Institute, B. Pecherskaya 25, Nizhny Novgorod, 603950, RussiaRadiophysical Research Institute, B. Pecherskaya 25, Nizhny Novgorod, 603950, RussiaUHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density irregularities, bremsstrahlung and excitation of high Rydberg states of the neutral particles by the accelerated electrons are discussed.<br><br><b>Key words.</b> Ionosphere (active experiments; wave-particle interactions) – Solar physics, astrophysics, and astronomy (radio emissions)https://www.ann-geophys.net/20/1687/2002/angeo-20-1687-2002.pdf
collection DOAJ
language English
format Article
sources DOAJ
author S. M. Grach
S. M. Grach
V. M. Fridman
L. M. Lifshits
T. S. Podstrigach
E. N. Sergeev
S. D. Snegirev
spellingShingle S. M. Grach
S. M. Grach
V. M. Fridman
L. M. Lifshits
T. S. Podstrigach
E. N. Sergeev
S. D. Snegirev
<i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
Annales Geophysicae
author_facet S. M. Grach
S. M. Grach
V. M. Fridman
L. M. Lifshits
T. S. Podstrigach
E. N. Sergeev
S. D. Snegirev
author_sort S. M. Grach
title <i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
title_short <i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
title_full <i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
title_fullStr <i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
title_full_unstemmed <i>Letter to the Editor</i> <br>UHF electromagnetic emission stimulated by HF pumping of the ionosphere
title_sort <i>letter to the editor</i> <br>uhf electromagnetic emission stimulated by hf pumping of the ionosphere
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2002-10-01
description UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density irregularities, bremsstrahlung and excitation of high Rydberg states of the neutral particles by the accelerated electrons are discussed.<br><br><b>Key words.</b> Ionosphere (active experiments; wave-particle interactions) – Solar physics, astrophysics, and astronomy (radio emissions)
url https://www.ann-geophys.net/20/1687/2002/angeo-20-1687-2002.pdf
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