Now showing items 21-36 of 36

    • 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 ...
    • Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population 

      Ferrão, Sabrina Tigik; Petruzzellis, Larissa Teixeira; Ziebell, Luiz Fernando; Yoon, Peter H.; Gaelzer, Rudi (2017) [Journal article]
      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 ...