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Waves and instabilities in dusty space plasmas 总被引:1,自引:0,他引:1
Frank Verheest 《Space Science Reviews》1996,77(3-4):267-302
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Space Science Reviews - 相似文献
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Frank Verheest 《Space Science Reviews》1994,68(1-4):109-114
Nonlinear modes are investigated in magnetized dusty plasmas, where the dust dynamics is modelled by a number of cold, highly negatively charged and very massive fluids, besides ordinary electrons and protons. Several low-frequency motions occur which are typical for the dust components, some of them described by model equations such as the derivative nonlinear Schrödinger equation for electromagnetic waves. One can include equilibrium drifts and even fluctuations in the grain charges. Most of the preceding conclusions are relevant for different kinds of astrophysical and heliospheric plasmas. 相似文献
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Space observations in several near-Earth environments have revealed the presence of positive-potential, large-amplitude electrostatic
structures, associated with high-frequency disturbances, and indicative of electron dynamics. Earlier models proposed in terms
of electron-acoustic solitary waves in a two-electron-temperature plasma were inadequate, because only negative potential
structures could thus be obtained, whereas the observations point to positive potential structures. In this paper, it is shown
that the theoretical restriction to negative potential solitons is due to the neglect of the inertia of the hot electrons,
implicitly or explicitly assumed in previous papers. If hot electron inertia is retained, however, there exists a parameter
range where positive potential solitary waves are formed, which can have important consequences for the re-interpretation
of several astrophysical phenomena involving two-electron-temperature plasmas.
PACS: 52.35.Mw, 52.35.Sb, 96.50.Ry 相似文献
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