Browsing Exact and Earth Sciences by Subject "Turbulência em plasmas"

Now showing items 1-13 of 13

    • Electromagnetic weak turbulence theory revisited 

      Yoon, Peter H.; Ziebell, Luiz Fernando; Gaelzer, Rudi; Pavan, Joel (2012) [Journal article]
      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 ...

    • Nonlinear evolution of beam-plasma instability in inhomogeneous medium 

      Ziebell, Luiz Fernando; Yoon, Peter H.; Pavan, Joel; Gaelzer, Rudi (2011) [Journal article]
      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 

      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 ...

    • 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 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 ...

    • 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 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 ...

    • 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 time evolution of beam-plasma instability in the presence of binary collisions 

      Ferrão, Sabrina Tigik; Ziebell, Luiz Fernando; Yoon, Peter H.; Kontar, Eduard (2016) [Journal article]
      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 

      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 ...

    • Weak turbulence in dusty plasmas with collisional dust charging : quasilinear wave-particle interaction 

      Galvão, Renato Andrade; Ziebell, Luiz Fernando (2015) [Journal article]
      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 

      Yoon, Peter H.; Ziebell, Luiz Fernando; Kontar, Eduard; Schlickeiser, Reinhard (2016) [Journal article]
      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 ...