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Titolo:
WEAK LANGMUIR TURBULENCE
Autore:
MUSHER SL; RUBENCHIK AM; ZAKHAROV VE;
Indirizzi:
RUSSIAN ACAD SCI,INST AUTOMAT NOVOSIBIRSK 630090 RUSSIA LAWRENCE LIVERMORE NATL LAB,PLASMA PHYS RES INST LIVERMORE CA 94550 UNIV CALIF DAVIS,DEPT APPL SCI DAVIS CA 95616 RUSSIAN ACAD SCI,LD LANDAU THEORET PHYS INST MOSCOW 117334 RUSSIA UNIV ARIZONA,DEPT MATH TUCSON AZ 85721
Titolo Testata:
Physics reports
fascicolo: 4, volume: 252, anno: 1995,
pagine: 178 - 274
SICI:
0370-1573(1995)252:4<178:WLT>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
DECAY INSTABILITY; IONOSPHERIC MODIFICATION; NONLINEAR EVOLUTION; SATURATION SPECTRUM; ION TEMPERATURES; ELECTRON-BEAM; PLASMA; COLLAPSE;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
139
Recensione:
Indirizzi per estratti:
Citazione:
S.L. Musher et al., "WEAK LANGMUIR TURBULENCE", Physics reports, 252(4), 1995, pp. 178-274

Abstract

Weak turbulence theory presents a regular method for a statistical description of nonlinear wave interactions. The present review deals with an application of weak turbulence theory to Langmuir wave turbulence. Our main attention is devoted to a plasma with comparable ion and electron temperatures, both magnetized and unmagnetized. In this practically important situation ion-sound motions are heavily damped, which simplifies the physics of nonlinear phenomena. We will demonstrate thatthe turbulence spectra are highly anisotropic and take the form of ''jets'' in k-space, and that the onset of a steady state is nontrivial and sometimes does not occur at all. On the base of the jet-like spectra approach it is possible to find the turbulence spectra, to evaluatethe anomalous absorption rate and to determine the comparable role ofthe different absorption mechanisms for a number of practical problems: the excitation of waves by powerful electromagnetic radiation or byelectron and ion beams. We demonstrate also that the range in which pure weak turbulence is valid is pretty narrow. The jet-like spectra structure stimulates a modulation instability and after that wave self-focusing and collapse. Then, weak and strong turbulence coexist. The final part of the review deals with the turbulence of nonisothermal plasmas when additional degrees of freedom are excited. We demonstrate that the ideas, models and methods, presented in this review, give us a chance to advance greatly in the understanding of turbulence patterns.

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Documento generato il 21/09/20 alle ore 12:58:59