Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma
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 dist...
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2014-02-01
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Series: | Nonlinear Processes in Geophysics |
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doaj-20b3992d864c4141a4350a145efa48332020-11-24T22:33:44ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462014-02-0121133934610.5194/npg-21-339-2014Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasmaY. Nariyuki0T. Umeda1T. K. Suzuki2T. Hada3Faculty of Human Development, University of Toyama, 3190, Toyama City, Toyama 930-8555, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, JapanDepartment of Physics, Nagoya University, Furo-cho, Nagoya, Aichi 464-8602, JapanDepartment of Earth System Science and Technology, Kyushu University, 6-1, Kasuga City, Fukuoka 816-8580, JapanThe 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.http://www.nonlin-processes-geophys.net/21/339/2014/npg-21-339-2014.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Y. Nariyuki T. Umeda T. K. Suzuki T. Hada |
spellingShingle |
Y. Nariyuki T. Umeda T. K. Suzuki T. Hada Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma Nonlinear Processes in Geophysics |
author_facet |
Y. Nariyuki T. Umeda T. K. Suzuki T. Hada |
author_sort |
Y. Nariyuki |
title |
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma |
title_short |
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma |
title_full |
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma |
title_fullStr |
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma |
title_full_unstemmed |
Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma |
title_sort |
ion acceleration by parallel propagating nonlinear alfvén wave packets in a radially expanding plasma |
publisher |
Copernicus Publications |
series |
Nonlinear Processes in Geophysics |
issn |
1023-5809 1607-7946 |
publishDate |
2014-02-01 |
description |
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. |
url |
http://www.nonlin-processes-geophys.net/21/339/2014/npg-21-339-2014.pdf |
work_keys_str_mv |
AT ynariyuki ionaccelerationbyparallelpropagatingnonlinearalfvenwavepacketsinaradiallyexpandingplasma AT tumeda ionaccelerationbyparallelpropagatingnonlinearalfvenwavepacketsinaradiallyexpandingplasma AT tksuzuki ionaccelerationbyparallelpropagatingnonlinearalfvenwavepacketsinaradiallyexpandingplasma AT thada ionaccelerationbyparallelpropagatingnonlinearalfvenwavepacketsinaradiallyexpandingplasma |
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1725729605538545664 |