Dynamics of coherent structures and turbulence of plasma drift waves

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A simple model based on the Hasegawa-Mima equation is used to study dipole vortex interactions and turbulence of electrostatic drift waves in a plasma. It is shown that if nonlinear effects are important during vortex collisions, dipoles are broken into monopoles. Nonadiabatic effects also affect di...

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Autores principales: Fontán, C.F., Verga, A.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 1995
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1063651X_v52_n6_p6717_Fontan
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_1063651X_v52_n6_p6717_Fontan2023-06-12T16:49:04Z Dynamics of coherent structures and turbulence of plasma drift waves Physical Review E 1995;52(6):6717-6735 Fontán, C.F. Verga, A. A simple model based on the Hasegawa-Mima equation is used to study dipole vortex interactions and turbulence of electrostatic drift waves in a plasma. It is shown that if nonlinear effects are important during vortex collisions, dipoles are broken into monopoles. Nonadiabatic effects also affect dipole behavior, which can be destroyed by the instability of emitted waves (dipole vortex radiation). Simulations of turbulence in both decaying and driven cases show the appearance of long-lived monopole structures. These coherent structures contribute to stop the cascade of energy to large scales, and then to reach a self-organized stationary state. Some numerical evidence is done that Hasegawa-Mima turbulence has a long-time behavior that is much richer than the thermodynamic equilibrium state observed in two-dimensional hydrodynamics. In driven turbulence, an important departure from Gaussian statistics of vorticity fluctuations is found, giving some indication of intermittency. Using various analyzing techniques, in particular the proper orthogonal decomposition, we show that the turbulence can be characterized by a field of coherent structures, which dominates the dynamics of the system, and random waves interacting weakly with the coherent structures. (c) 1995 The American Physical Society © 1995 The American Physical Society. Fil:Verga, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1995 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1063651X_v52_n6_p6717_Fontan
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
description A simple model based on the Hasegawa-Mima equation is used to study dipole vortex interactions and turbulence of electrostatic drift waves in a plasma. It is shown that if nonlinear effects are important during vortex collisions, dipoles are broken into monopoles. Nonadiabatic effects also affect dipole behavior, which can be destroyed by the instability of emitted waves (dipole vortex radiation). Simulations of turbulence in both decaying and driven cases show the appearance of long-lived monopole structures. These coherent structures contribute to stop the cascade of energy to large scales, and then to reach a self-organized stationary state. Some numerical evidence is done that Hasegawa-Mima turbulence has a long-time behavior that is much richer than the thermodynamic equilibrium state observed in two-dimensional hydrodynamics. In driven turbulence, an important departure from Gaussian statistics of vorticity fluctuations is found, giving some indication of intermittency. Using various analyzing techniques, in particular the proper orthogonal decomposition, we show that the turbulence can be characterized by a field of coherent structures, which dominates the dynamics of the system, and random waves interacting weakly with the coherent structures. (c) 1995 The American Physical Society © 1995 The American Physical Society.
format Artículo
Artículo
publishedVersion
author Fontán, C.F.
Verga, A.
spellingShingle Fontán, C.F.
Verga, A.
Dynamics of coherent structures and turbulence of plasma drift waves
author_facet Fontán, C.F.
Verga, A.
author_sort Fontán, C.F.
title Dynamics of coherent structures and turbulence of plasma drift waves
title_short Dynamics of coherent structures and turbulence of plasma drift waves
title_full Dynamics of coherent structures and turbulence of plasma drift waves
title_fullStr Dynamics of coherent structures and turbulence of plasma drift waves
title_full_unstemmed Dynamics of coherent structures and turbulence of plasma drift waves
title_sort dynamics of coherent structures and turbulence of plasma drift waves
publishDate 1995
url http://hdl.handle.net/20.500.12110/paper_1063651X_v52_n6_p6717_Fontan
work_keys_str_mv AT fontancf dynamicsofcoherentstructuresandturbulenceofplasmadriftwaves
AT vergaa dynamicsofcoherentstructuresandturbulenceofplasmadriftwaves
_version_ 1769810396815818752

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