skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: PARTICLE SCATTERING OFF OF RIGHT-HANDED DISPERSIVE WAVES

Abstract

Resonant scattering of fast particles off low frequency plasma waves is a major process determining transport characteristics of energetic particles in the heliosphere and contributing to their acceleration. Usually, only Alfvén waves are considered for this process, although dispersive waves are also present throughout the heliosphere. We investigate resonant interaction of energetic electrons with dispersive, right-handed waves. For the interaction of particles and a single wave a variable transformation into the rest frame of the wave can be performed. Here, well-established analytic models derived in the framework of magnetostatic quasi-linear theory can be used as a reference to validate simulation results. However, this approach fails as soon as several dispersive waves are involved. Based on analytic solutions modeling the scattering amplitude in the magnetostatic limit, we present an approach to modify these equations for use in the plasma frame. Thereby we aim at a description of particle scattering in the presence of several waves. A particle-in-cell code is employed to study wave–particle scattering on a micro-physically correct level and to test the modified model equations. We investigate the interactions of electrons at different energies (from 1 keV to 1 MeV) and right-handed waves with various amplitudes. Differences between model andmore » simulation arise in the case of high amplitudes or several waves. Analyzing the trajectories of single particles we find no microscopic diffusion in the case of a single plasma wave, although a broadening of the particle distribution can be observed.« less

Authors:
; ;  [1]
  1. Centre for Space Research, North-West University, 2520 Potchefstroom (South Africa)
Publication Date:
OSTI Identifier:
22664062
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 834; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ALFVEN WAVES; ANALYTICAL SOLUTION; DIFFUSION; DISTRIBUTION; EQUATIONS; HELIOSPHERE; INTERACTIONS; KEV RANGE; PLASMA WAVES; RESONANCE SCATTERING; SCATTERING AMPLITUDES; SIMULATION; SUN; TAIL ELECTRONS; TRANSFORMATIONS

Citation Formats

Schreiner, C., Kilian, P., and Spanier, F., E-mail: cschreiner@astro.uni-wuerzburg.de. PARTICLE SCATTERING OFF OF RIGHT-HANDED DISPERSIVE WAVES. United States: N. p., 2017. Web. doi:10.3847/1538-4357/834/2/161.
Schreiner, C., Kilian, P., & Spanier, F., E-mail: cschreiner@astro.uni-wuerzburg.de. PARTICLE SCATTERING OFF OF RIGHT-HANDED DISPERSIVE WAVES. United States. doi:10.3847/1538-4357/834/2/161.
Schreiner, C., Kilian, P., and Spanier, F., E-mail: cschreiner@astro.uni-wuerzburg.de. Tue . "PARTICLE SCATTERING OFF OF RIGHT-HANDED DISPERSIVE WAVES". United States. doi:10.3847/1538-4357/834/2/161.
@article{osti_22664062,
title = {PARTICLE SCATTERING OFF OF RIGHT-HANDED DISPERSIVE WAVES},
author = {Schreiner, C. and Kilian, P. and Spanier, F., E-mail: cschreiner@astro.uni-wuerzburg.de},
abstractNote = {Resonant scattering of fast particles off low frequency plasma waves is a major process determining transport characteristics of energetic particles in the heliosphere and contributing to their acceleration. Usually, only Alfvén waves are considered for this process, although dispersive waves are also present throughout the heliosphere. We investigate resonant interaction of energetic electrons with dispersive, right-handed waves. For the interaction of particles and a single wave a variable transformation into the rest frame of the wave can be performed. Here, well-established analytic models derived in the framework of magnetostatic quasi-linear theory can be used as a reference to validate simulation results. However, this approach fails as soon as several dispersive waves are involved. Based on analytic solutions modeling the scattering amplitude in the magnetostatic limit, we present an approach to modify these equations for use in the plasma frame. Thereby we aim at a description of particle scattering in the presence of several waves. A particle-in-cell code is employed to study wave–particle scattering on a micro-physically correct level and to test the modified model equations. We investigate the interactions of electrons at different energies (from 1 keV to 1 MeV) and right-handed waves with various amplitudes. Differences between model and simulation arise in the case of high amplitudes or several waves. Analyzing the trajectories of single particles we find no microscopic diffusion in the case of a single plasma wave, although a broadening of the particle distribution can be observed.},
doi = {10.3847/1538-4357/834/2/161},
journal = {Astrophysical Journal},
number = 2,
volume = 834,
place = {United States},
year = {Tue Jan 10 00:00:00 EST 2017},
month = {Tue Jan 10 00:00:00 EST 2017}
}
  • The nonlinear phenomena are of prominent interests in understanding the particle acceleration and transportation in the interplanetary space. The ponderomotive nonlinearity causing the filamentation of the parallel propagating circularly polarized dispersive Alfvén wave having a finite frequency may be one of the mechanisms that contribute to the heating of the plasmas. The contribution will be different of the left (L) handed mode, the right (R) handed mode, and the mix mode. The contribution also depends upon the finite frequency of the circularly polarized waves. In the present paper, we have investigated the effect of the nonlinear coupling of the Lmore » and R circularly polarized dispersive Alfvén wave on the localized structures formation and the respective power spectra. The dynamical equations are derived in the presence of the ponderomotive nonlinearity of the L and R pumps and then studied semi-analytically as well as numerically. The ponderomotive nonlinearity accounts for the nonlinear coupling between both the modes. In the presence of the adiabatic response of the density fluctuations, the nonlinear dynamical equations satisfy the modified nonlinear Schrödinger equation. The equations thus obtained are solved in solar wind regime to study the coupling effect on localization and the power spectra. The effect of coupling is also studied on Faraday rotation and ellipticity of the wave caused due to the difference in the localization of the left and the right modes with the distance of propagation.« less
  • The relative absence of {bar {nu}}{sub {mu}}-induced charged current events with respect to {nu}{sub {mu}}-induced events at large ({gt}0.45) and large {ital y} ({gt}0.70) enables us to limit the right handed coupling of the weak current. Our data restrict {vert bar}{eta}{vert bar}{sup 2}={vert bar}{ital g}{sub {ital R}}/{ital g}{sub {ital L}}{vert bar}{sup 2}{lt}0.0 015 with 90% C.L. Within the framework of left-right symmetric models, this measurement imposes a limit upon the mixing angle of the left and right handed bosons. Unlike the limits imposed by the {mu}-decay and nuclear {beta}-decay experiments, our limit is valid irrespective of the mass of themore » right handed neutrino.« less
  • The production of heavy quarks is considered in the quark--parton model. The model is shown to account for the energy-dependent effects of large produced masses. By considering the inclusive, charged-current neutrino scattering data as a function of energy, it is possible to distinguish between the standard four-quark model and models with right-handed currents and additional heavy quarks. It appears that the present data favor the latter models, and allow estimates of the masses of new quarks. (AIP)