Browsing Exact and Earth Sciences by Author "Gaelzer, Rudi"
Now showing items 21-40 of 41
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Oblique Alfvén waves in a stellar wind environment with dust particles charged by inelastic collisions and by photoionization
De Toni, Luan Bottin; Gaelzer, Rudi; Ziebell, Luiz Fernando (2022) [Journal article]The characteristics of Alfvén waves propagating in a direction oblique to the ambient magnetic field in a stellar wind environment are discussed. A kinetic formulation for a magnetized dusty plasma is adopted considering ... -
Obliquely propagating electromagnetic waves in magnetized kappa plasmas
Gaelzer, Rudi; Ziebell, Luiz Fernando (2016) [Journal article]Velocity distribution functions (VDFs) that exhibit a power-law dependence on the high-energy tail have been the subject of intense research by the plasma physics community. Such functions, known as kappa or superthermal ... -
On the dimensionally correct kinetic theory of turbulence for parallel propagation
Gaelzer, Rudi; Yoon, Peter H.; Kim, Sunjung; Ziebell, Luiz Fernando (2015) [Journal article]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 ... -
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability
Ziebell, Luiz Fernando; Gaelzer, Rudi (2017) [Journal article]The dispersion relation for ion-cyclotron waves propagating along the direction of the ambient magnetic field is investigated numerically by considering different forms of kappa functions as velocity distributions of ions ... -
On the Onsager symmetry of the effective dialetric tensor for plasmas in inhomogeneous magnetic field
Schneider, Ruth de Souza; Ziebell, Luiz Fernando; Gaelzer, Rudi (2004) [Journal article] -
Particle-in-cell and weak turbulence simulations of plasma emission
Lee, Sang-Yun; Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi; Lee, Ensang (2019) [Journal article]The plasma emission process, which is the mechanism for solar type II and type III radio burst phenomena, is studied by means of particle-in-cell (PIC) and weak turbulence (WT) simulation methods. “Plasma emission” is meant ... -
Particle-in-cell simulations on spontaneous thermal magnetic field fluctuations
Simões Júnior, Fernando Jaques Ruiz; Pavan, Joel; Gaelzer, Rudi; Ziebell, Luiz Fernando; Yoon, Peter H. (2013) [Journal article]In this paper an electromagnetic particle code is used to investigate the spontaneous thermal emission. Specifically we perform particle-in-cell simulations employing a non-relativistic isotropic Maxwellian particle ... -
Plasma emission by counter-streaming electron beams
Ziebell, Luiz Fernando; Petruzzellis, Larissa Teixeira; Yoon, Peter H.; Gaelzer, Rudi; Pavan, Joel (2016) [Journal article]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 nonlinear electromagnetic processes
Ziebell, Luiz Fernando; Yoon, Peter H.; Petruzzellis, Larissa Teixeira; Gaelzer, Rudi; Pavan, Joel (2015) [Journal article]The plasma emission, or electromagnetic (EM) radiation at the plasma frequency and/or its harmonic(s), is generally accepted as the radiation mechanism responsible for solar type II and III radio bursts. Identification and ... -
Plasma emission by weak turbulence processes
Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi; Pavan, Joel (2014) [Journal article]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
Ryu, Chang-Mo; Ahn, Hee-Chul; Rhee, Tongnyeol; Yoon, Peter H.; Ziebell, Luiz Fernando; Gaelzer, Rudi; Figueroa Viñas, Adolfo (2009) [Journal article]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 ... -
Solar wind strahl broadening by self-generated plasma waves
Pavan, Joel; Figueroa Viñas, Adolfo; Yoon, Peter H.; Ziebell, Luiz Fernando; Gaelzer, Rudi (2013) [Journal article]This Letter reports on the results of numerical simulations which may provide a possible explanation for the strahl broadening during quiet solar conditions. The relevant processes involved in the broadening are due to ... -
Spontaneous emission of electromagnetic radiation in turbulent plasmas
Ziebell, Luiz Fernando; Yoon, Peter H.; Simões Júnior, Fernando Jaques Ruiz; Gaelzer, Rudi; Pavan, Joel (2014) [Journal article]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 ... -
The dispersion relation for eletrostatic fluctuations in weakly inhomogeneous plasmas
Silveira, Omar Junior Garcia; Ziebell, Luiz Fernando; Schneider, Ruth de Souza; Gaelzer, Rudi (2004) [Journal article] -
The effective longitudinal dielectric constant for plasmas in inhomogeneous magnetic fields
Gaelzer, Rudi; Ziebell, Luiz Fernando; Schneider, Ruth de Souza (2004) [Journal article] -
The general dielectric tensor for bi-kappa magnetized plasmas
Gaelzer, Rudi; Ziebell, Luiz Fernando; Meneses, Anelise Ramires (2016) [Journal article]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 ... -
The oblique firehose instability in a bi-kappa magnetized plasma
Meneses, Anelise Ramires; Gaelzer, Rudi; Ziebell, Luiz Fernando (2018) [Journal article]In this work, we derive a dispersion equation that describes the excitation of the oblique (or Alfvén) firehose instability in a plasma that contains both electron and ion species modelled by bi-kappa velocity distribution ... -
Transition from thermal to turbulent equilibrium with a resulting electromagnetic spectrum
Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi; Pavan, Joel (2014) [Journal article]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 kinetic analysis of electrostatic harmonic plasma waves
Pongutá, Éber Camilo Fonseca; Ziebell, Luiz Fernando; Gaelzer, Rudi; Yoon, Peter H. (2016) [Journal article]Electrostatic harmonic Langmuir waves are virtual modes excited in weakly turbulent plasmas, first observed in early laboratory beam-plasma experiments as well as in rocket-borne active experiments in space. However, their ... -
Unified formulation for inhomogeneity-driven instabilities in the lower-hybrid range
Silveira, Omar Junior Garcia; Ziebell, Luiz Fernando; Gaelzer, Rudi; Yoon, Peter H. (2002) [Journal article]A local dispersion relation that describes inhomogeneity-driven instabilities in the lower-hybrid range is derived following a procedure that correctly describes energy exchange between waves and particles in inhomogeneous ...