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

Journal metrics

  • IF value: 1.321 IF 1.321
  • IF 5-year<br/> value: 1.636 IF 5-year
    1.636
  • SNIP value: 0.903 SNIP 0.903
  • SJR value: 0.709 SJR 0.709
  • IPP value: 1.455 IPP 1.455
  • h5-index value: 20 h5-index 20
Nonlin. Processes Geophys., 21, 339-346, 2014
http://www.nonlin-processes-geophys.net/21/339/2014/
doi: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
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma
Y. Nariyuki1, T. Umeda2, T. K. Suzuki3, and T. Hada4 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.

Citation: Nariyuki, Y., Umeda, T., Suzuki, T. K., and Hada, T.: Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma, Nonlin. Processes Geophys., 21, 339-346, doi:10.5194/npg-21-339-2014, 2014.
Publications Copernicus
Download
Share