Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.699 IF 1.699
  • IF 5-year value: 1.559 IF 5-year
    1.559
  • CiteScore value: 1.61 CiteScore
    1.61
  • SNIP value: 0.884 SNIP 0.884
  • IPP value: 1.49 IPP 1.49
  • SJR value: 0.648 SJR 0.648
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 52 Scimago H
    index 52
  • h5-index value: 21 h5-index 21
Volume 21, issue 1
Nonlin. Processes Geophys., 21, 339–346, 2014
https://doi.org/10.5194/npg-21-339-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Nonlinear waves and chaos in space plasmas

Nonlin. Processes Geophys., 21, 339–346, 2014
https://doi.org/10.5194/npg-21-339-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 27 Feb 2014

Research article | 27 Feb 2014

Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma

Y. Nariyuki1, T. Umeda2, T. K. Suzuki3, and T. Hada4 Y. Nariyuki et al.
  • 1Faculty of Human Development, University of Toyama, 3190, Toyama City, Toyama 930-8555, Japan
  • 2Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan
  • 3Department of Physics, Nagoya University, Furo-cho, Nagoya, Aichi 464-8602, Japan
  • 4Department of Earth System Science and Technology, Kyushu University, 6-1, Kasuga City, Fukuoka 816-8580, Japan

Abstract. The numerical simulation of the nonlinear evolution of the parallel propagating Alfvén waves in a radially expanding plasma is performed by using a kinetic-fluid model (the Vlasov–MHD model). In our study, both the nonlinear evolution of the Alfvén waves and the radial evolution of the velocity distribution function (VDF) are treated simultaneously. On the other hand, important ion kinetic effects such as ion cyclotron damping and instabilities driven by the non-equilibrium ion velocity distributions are not included in the present model. The results indicate that the steepened Alfvén wave packets outwardly accelerate ions, which can be observed as the beam components in the interplanetary space. The energy of imposed Alfvén waves is converted into the longitudinal fluctuations by the nonlinear steepening and the nonlinear Landau damping. The wave shoaling due to the inhomogeneity of the phase velocity is also observed.

Publications Copernicus
Download
Citation