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Titolo:
Numerical simulation studies on the broad upshifted maximum of ionosphericstimulated electromagnetic emission
Autore:
Xi, H; Scales, WA;
Indirizzi:
Virginia Polytech Inst & State Univ, Bradley Dept Elect & Comp Engn, Blacksburg, VA 24061 USA Virginia Polytech Inst & State Univ Blacksburg VA USA 24061 VA 24061 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A7, volume: 106, anno: 2001,
pagine: 12787 - 12801
SICI:
0148-0227(20010701)106:A7<12787:NSSOTB>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-CYCLOTRON HARMONICS; PLASMA-WAVES; RADIATION; DECAY; FREQUENCIES; INSTABILITY; TURBULENCE; BAND; SEE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Xi, H Virginia Polytech Inst & State Univ, Bradley Dept Elect & Comp Engn,Blacksburg, VA 24061 USA Virginia Polytech Inst & State Univ Blacksburg VA USA 24061 061 USA
Citazione:
H. Xi e W.A. Scales, "Numerical simulation studies on the broad upshifted maximum of ionosphericstimulated electromagnetic emission", J GEO R-S P, 106(A7), 2001, pp. 12787-12801

Abstract

Stimulated electromagnetic emission (SEE) produced by interactions of high-power radio waves with the Earth's ionosphere is currently a topic of significant interest in ionospheric modification physics. SEE is believed to beproduced by nonlinear wave-wave interactions involving the electromagneticand electrostatic plasma waves in the altitude region where the pump wave frequency is near the upper hybrid resonance frequency. The most prominent upshifted feature in the SEE spectrum is the broad upshifted maximum (BUM). From characteristics of this feature, a four-wave parametric decay processhas been proposed as a viable mechanism for its production. The object of this work is to (1) investigate the early time nonlinear development of thefour-wave decay instability by using theoretical and numerical simulation models, (2) study the variation of the four-wave decay instability spectralfeatures for a wide range of plasma and pump wave parameters, and (3) access its possible role in the production of the BUM spectral feature. Resultsof this investigation show that there is good agreement between predictions of the proposed theoretical model and the numerical simulation experiments. The simulation electric field power spectrum exhibits many of the important features of the experimental observations. The numerical simulation results show that consideration of the full nonlinear development of the four-wave parametric instability is crucial in providing insight into the asymmetric nature of the wave frequency spectrum observed during the experiments.

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Documento generato il 11/07/20 alle ore 20:53:18