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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}
}