Listar Ciencias Exactas y Naturales por autor "Gaelzer, Rudi"
Mostrando ítems 1-20 de 41
-
Alfvén waves in dusty plasmas with plasma particles described by anisotropic kappa distributions
Galvão, Renato Andrade; Ziebell, Luiz Fernando; Gaelzer, Rudi; Juli, Marcelo Camargo de (2012) [Artículo de periódico]We utilize a kinetic description to study the dispersion relation of Alfv en waves propagating parallelly to the ambient magnetic field in a dusty plasma, taking into account the fluctuation of the charge of the dust ... -
Asymmetric solar wind electron superthermal distributions
Gaelzer, Rudi; Ziebell, Luiz Fernando; Figueroa Viñas, Adolfo; Yoon, Peter H.; Ryu, Chang-Mo (2008) [Artículo de periódico]Electron distributions with various degrees of asymmetry associated with the energetic tail population are commonly detected in the solar wind near 1 AU. By numerically solving one-dimensional electrostatic weak turbulence ... -
Comment o "Onsager symmetry for inhomogeneous magnetized plasmas" [Phys. Plasmas 3.4225 (1996)]
Schneider, Ruth de Souza; Ziebell, Luiz Fernando; Gaelzer, Rudi (1997) [Artículo de periódico] -
Dielectric tensor for inhomogeneous plasmas in inhomogeneous magnetic field
Gaelzer, Rudi; Ziebell, Luiz Fernando; Silveira, Omar Junior Garcia (1999) [Artículo de periódico]The derivation of explicit expressions for the effective dielectric tensor to be utilized in the dispersion relation for weakly inhomogeneous plasmas is discussed. The general expressions obtained are useful for situations ... -
Dispersion function for plasmas with loss-cone distributions in an inhomogeneous magnetic field
Gaelzer, Rudi; Schneider, Ruth de Souza; Ziebell, Luiz Fernando (1997) [Artículo de periódico]The dispersion relation for electromagnetic waves in a magnetized plasma with weakly inhomogeneous magnetic field is investigated within the framework of a WKB approximation. A dispersion function useful for the case of ... -
Disperson relation and the dielectric tensor for magnetized plasmas with inhomogeneous magnetic field
Gaelzer, Rudi; Schneider, Ruth de Souza; Ziebell, Luiz Fernando (1995) [Artículo de periódico]We investigate the dispersion relation for a magnetized plasma with weak magnetic field gradients perpendicular to the ambient magnetic field. An explicit expression for the effective dielectric tensor is derived, incorporating ... -
Dynamic of Langmuir wave decay in two dimensions
Ziebell, Luiz Fernando; Gaelzer, Rudi; Yoon, Peter H. (2008) [Artículo de periódico]The present paper reports on the first two-dimensional 2D self-consistent solution of weak turbulence equations describing the evolution of electron-beam-plasma interaction in which quasilinear as well as nonlinear three-wave ... -
Effects of dust charge variation on electrostatic waves in dusty plasmas with temperature anisotropy
Juli, Marcelo Camargo de; Schneider, Ruth de Souza; Ziebell, Luiz Fernando; Gaelzer, Rudi (2009) [Artículo de periódico]We utilize a kinetic approach to the problem of wave propagation in dusty plasmas, taking into account the variation of the charge of the dust particles due to inelastic collisions with electrons and ions. The components ... -
Effects of dust particles charged by inelastic collisions and by photoionization on Alfven waves in a stellar wind
De Toni, Luan Bottin; Gaelzer, Rudi (2021) [Artículo de periódico]Using a kinetic description of a homogeneous magnetized dusty plasma with Maxwellian distribution of electrons and protons and dust particles charged by inelastic collisions and by photoionization, we analyse the dispersion ... -
Electromagnetic weak turbulence theory revisited
Yoon, Peter H.; Ziebell, Luiz Fernando; Gaelzer, Rudi; Pavan, Joel (2012) [Artículo 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 ... -
Generation of harmonic Langmuir mode by beam-plasma instability
Gaelzer, Rudi; Ziebell, Luiz Fernando; Yoon, Peter H. (2002) [Artículo de periódico]In this article, numerical solutions of the generalized weak turbulence equation [P. H. Yoon, Phys. Plasmas 7, 4858 (2000)] are carried out. In the generalized weak turbulence theory, the generation of the 2vpe-harmonic ... -
Group velocity of obliquely propagating Alfvén waves in a magnetized dusty plasma
De Toni, Luan Bottin; Gaelzer, Rudi; Ziebell, Luiz Fernando (2022) [Artículo de periódico]In this work, we investigate the characteristics of the group velocity of obliquely propagating Alfvén in a dusty plasma typical of a stellar wind. The dispersion relation is derived with the aid of the kinetic theory for ... -
Ion-cyclotron instability in plasmas described by product-bi-kappa distributions
Santos, Michel Silva dos; Ziebell, Luiz Fernando; Gaelzer, Rudi (2015) [Artículo de periódico]The dispersion relation for parallel propagating waves in the ion-cyclotron branch is investigated numerically by considering that the velocity distribution of the ion population is a function of type product-bi-kappa. We ... -
Ion firehose instability in plasmas with plasma particles described by product bi-kappa distributions
Santos, Michel Silva dos; Ziebell, Luiz Fernando; Gaelzer, Rudi (2014) [Artículo de periódico]We investigate the dispersion relation for low frequency electromagnetic waves propagating parallel to the ambient magnetic field, considering that the velocity distributions of ions and electrons can be either bi-Maxwellian ... -
Ionospheric ion-acoustic enhancements by turbulent counterstreaming electron beam-plasma interaction
Pavan, Joel; Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi (2010) [Artículo de periódico]Ion-acoustic enhancements are investigated within the context of turbulent beam-plasma interaction processes. The analysis assumes a pair of counterstreaming electron beams interacting with the background plasma. Two-dimensional ... -
Mode-coupling of low-frequency electromagnetic waves in dusty plasmas with temperature anisotropy
Juli, Marcelo Camargo de; Schneider, Ruth de Souza; Ziebell, Luiz Fernando; Gaelzer, Rudi (2007) [Artículo de periódico]This paper studies the effects of the presence of dust particles with variable charge, in fully ionized, homogeneous, magnetized plasma of electrons and ions, with the electrons and ions described by bi-Maxwellian distributions ... -
Multiple harmonics of electron waves studied using weak turbulence theory in a two-dimensional formulation
Pongutá, Éber Camilo Fonseca; Ziebell, Luiz Fernando; Gaelzer, Rudi (2021) [Artículo de periódico]Electrostatic waves with frequencies that are integer multiples of the electron plasma frequency have been observed since the early days of laboratory experiments on beam–plasma interactions, and also in experiments made ... -
A new formulation for the dielectric tensor for magnetized dusty plasmas with variable charge on the dust particles
Ziebell, Luiz Fernando; Schneider, Ruth de Souza; Juli, Marcelo Camargo de; Gaelzer, Rudi (2008) [Artículo de periódico]A kinetic approach to the problem of wave propagation in dusty plasmas, which takes into account the variation of the charge of the dust particles due to inelastic collisions with electrons and ions, is utilized as a ... -
Nonlinear development of weak beam-plasma instability
Ziebell, Luiz Fernando; Gaelzer, Rudi; Yoon, Peter H. (2001) [Artículo de periódico]Nonlinear interactions of tenuous electron beam, background, unmagnetized plasma, and self-consistently generated Langmuir and ion-sound waves are analyzed in the framework of plasma weak turbulence kinetic theory. Full ... -
Nonlinear evolution of beam-plasma instability in inhomogeneous medium
Ziebell, Luiz Fernando; Yoon, Peter H.; Pavan, Joel; Gaelzer, Rudi (2011) [Artículo 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 ...