Navegação por Assunto "Turbulência em plasmas"
Resultados 1-17 de 17
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Análise não linear da interação feixe-plasma na presença de colisões binárias
(2015) [Dissertação]A situação em que ocorre a interação entre um feixe de elétrons rápidos e um plasma é considerada um modelo fundamental para o estudo de instabilidades cinéticas em plasmas. A dinâmica não linear desta interação vem sendo ... -
Electromagnetic weak turbulence theory revisited
(2012) [Artigo de periódico]The statistical mechanical reformulation of weak turbulence theory for unmagnetized plasmas including fully electromagnetic effects was carried out by Yoon [Phys. Plasmas 13, 022302 (2006)]. However, the wave kinetic ... -
Estudo da interação feixe-plasma como aplicação da teoria de turbulência em plasmas
(2014) [Dissertação]Neste trabalho estudamos a interação feixe-plasma aplicando a teoria de turbulência fraca. Primeiramente fazemos uma introdução `a teoria cinética de plasmas, estudando aspectos fundamentais como: a abordagem estatística ... -
Evolução não linear de ondas eletrostáticas e eletromagnéticas no contexto da teoria de turbulência fraca em plasmas
(2014) [Dissertação]Este trabalho tem como objetivo principal fazer uma revisão da teoria de turbulência fraca em plasmas e caracterizar o efeito dos diferentes termos associados aos efeitos eletrostáticos e eletromagnéticos sobre a evolução ... -
Nonlinear evolution of beam-plasma instability in inhomogeneous medium
(2011) [Artigo de periódico]The problem of electron-beam propagation in inhomogeneous solar wind is intimately related to the solar type II and/or type III radio bursts. Many scientists have addressed this issue in the past bymeans of quasi-linear ... -
On the dimensionally correct kinetic theory of turbulence for parallel propagation
(2015) [Artigo de periódico]Yoon and Fang [Phys. Plasmas 15, 122312 (2008)] formulated a second-order nonlinear kinetic theory that describes the turbulence propagating in directions parallel/anti-parallel to the ambient magnetic field. Their theory ... -
Plasma emission by counter-streaming electron beams
(2016) [Artigo de periódico]The radiation emission mechanism responsible for both type-II and type-III solar radio bursts is commonly accepted as plasma emission. Recently Ganse et al. suggested that type-II radio bursts may be enhanced when the ... -
Plasma emission by weak turbulence processes
(2014) [Artigo de periódico]The plasma emission is the radiation mechanism responsible for solar type II and type III radio bursts. The first theory of plasma emission was put forth in the 1950s, but the rigorous demonstration of the process based ... -
Simulation of asymmetric solar wind electron distributions
(2009) [Artigo de periódico]The electron distributions detected in the solar wind feature varying degrees of anisotropic high-energy tail. In a recent work the present authors numerically solved the one-dimensional electrostatic weak turbulence ... -
Spontaneous emission of electromagnetic radiation in turbulent plasmas
(2014) [Artigo de periódico]Known radiation emission mechanisms in plasmas include bremmstrahlung (or free-free emission), gyro- and synchrotron radiation, cyclotron maser, and plasma emission. For unmagnetized plasmas, only bremmstrahlung and plasma ... -
Teoria de turbulência fraca em plasmas empoeirados
(2015) [Tese]Partindo das equações microscópicas exatas para uma plasma empoeirado não magnetizado, onde a carga das partículas de poeira é considerada como um novo grau de liberdade do sistema, desenvolvemos um sistema de equações ... -
The general dielectric tensor for bi-kappa magnetized plasmas
(2016) [Artigo de periódico]In this paper, we derive the dielectric tensor for a plasma containing particles described by an anisotropic superthermal (bi-kappa) velocity distribution function. The tensor components are written in terms of the ... -
Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum
(2014) [Artigo de periódico]A recent paper [Ziebell et al., Phys. Plasmas 21, 010701 (2014)] discusses a new type of radiation emission process for plasmas in a state of quasi-equilibrium between the particles and enhanced Langmuir turbulence. Such ... -
Two-dimensional time evolution of beam-plasma instability in the presence of binary collisions
(2016) [Artigo de periódico]Energetic electrons produced during solar flares are known to be responsible for generating solar type III radio bursts. The radio emission is a byproduct of Langmuir wave generation via beam-plasma interaction and nonlinear ... -
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population
(2017) [Artigo de periódico]Observations show that plasma particles in the solar wind frequently display power-law velocity distributions, which can be isotropic or anisotropic. Particularly, the velocity distribution functions of solar wind electrons ... -
Weak turbulence in dusty plasmas with collisional dust charging : quasilinear wave-particle interaction
(2015) [Artigo de periódico]Starting from the exact microscopic equations for an unmagnetized dusty plasma, where the dust charge is regarded as a new degree of freedom of the system, we present a self-consistent set of equations that is suitable for ... -
Weak turbulence theory for collisional plasmas
(2016) [Artigo de periódico]Plasma is an ionized gas inwhich the collective behavior dominates over the individual particle interactions. For this reason, plasma is often treated as collisionless or collision-free. However, the discrete nature of the ...
