caa a22 4500 386368244 CHVBK 20180307111944.0 cr unu---uuuuu 161130e198910 xx s 000 0 eng 10.1017/S0022377800014343 doi S0022377800014343 pii (NATIONALLICENCE)cambridge-10.1017/S0022377800014343 Hydrodynamic equations for a plasma in the region of the distribution-function plateau [Elektronische Daten] A hydrodynamic theory is presented for plasma particles whose distribution function is close to a plateau in some phase-space region for a finite one-dimensional phase-spase interval. In the framework of the methods of moments, a series expansion of the particle distribution function in an appropriate system of orthogonal (Legendre) polynomials near the state with a plateau is carried out. Deviations from the plateau are due to the presence of a heat flux. The expansion obtained for the distribution function is used to truncate the chain of hydrodynamic equations and to calculate the additional terms arising from the finiteness of the phase interval. The case of one-dimensional Langmuir turbulence is considered as an example. Expressions are presented for the moments of the quasilinear integral of collisions, which describe the variations of the macroscopic characteristics of resonant particles in the respective hydrodynamic equations. Criteria for applicability of the equations obtained are presented. Approximate invariants of motion are obtained in the extreme cases of narrow and broad plateaux. Copyright © Cambridge University Press 1989 Konikov Yu. V. Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Academy of Sciences of the USSR (IZMIRAN), Troitsk, Moscow Region 142092, U.S.S.R. Oraevskii V. N. Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Academy of Sciences of the USSR (IZMIRAN), Troitsk, Moscow Region 142092, U.S.S.R. Journal of Plasma Physics Cambridge University Press 42/2(1989-10), 257-268 0022-3778 42:2<257 1989 42 PLA https://doi.org/10.1017/S0022377800014343 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022377800014343 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Konikov Yu. V. Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Academy of Sciences of the USSR (IZMIRAN), Troitsk, Moscow Region 142092, U.S.S.R NATIONALLICENCE 700 1- Oraevskii V. N. Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Academy of Sciences of the USSR (IZMIRAN), Troitsk, Moscow Region 142092, U.S.S.R NATIONALLICENCE 773 0- Journal of Plasma Physics Cambridge University Press 42/2(1989-10), 257-268 0022-3778 42:2<257 1989 42 PLA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge