Weak double layers in ion‐acoustic turbulence
作者:
C. Barnes,
M. K. Hudson,
W. Lotko,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1985)
卷期:
Volume 28,
issue 4
页码: 1055-1062
ISSN:0031-9171
年代: 1985
DOI:10.1063/1.865028
出版商: AIP
数据来源: AIP
摘要:
The evolution of weak double layers in ion‐acoustic turbulence in one and two‐dimensional particle simulations is examined. Weak double layers (e&Jgr;≲Te) evolve in simulations when a subthermal electron drift is imposed on a long or nonperiodic system withTe/Ti≫1. Their growth rate increases with the electron drift, and they decay because of ion trapping. They do not form in weakly magnetized or unmagnetized two‐dimensional (2‐D) systems unless a nonuniformity is introduced in the initial or boundary conditions. When the plasma is strongly magnetized (&ohgr;ce>&ohgr;pe), they emerge from 2‐D ion‐acoustic turbulence as coherent structures localized transversely to the magnetic field.
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