Alfvén wave phase mixing driven by velocity shear in two dimensions

1999 ◽  
Author(s):  
M. S. Ruderman ◽  
M. L. Goldstein ◽  
D. A. Roberts ◽  
A. Deane ◽  
L. Ofman
Keyword(s):  
Two Dimensions ◽  
Velocity Shear ◽  
Phase Mixing ◽  
Wave Phase

Alfvén wave phase mixing driven by velocity shear in two-dimensional open magnetic configurations

1999 ◽  
Vol 104 (A8) ◽  
pp. 17057-17068 ◽  
Author(s):  
M. S. Ruderman ◽  
M. L. Goldstein ◽  
D. A. Roberts ◽  
A. Deane ◽  
L. Ofman
Keyword(s):  
Velocity Shear ◽  
Alfven Wave ◽  
Two Dimensional ◽  
Phase Mixing ◽  
Wave Phase

scholarly journals Alfvén wave phase-mixing in flows

2016 ◽  
Vol 586 ◽  
pp. A95 ◽  
Author(s):  
D. Tsiklauri
Keyword(s):  
Alfven Wave ◽  
Phase Mixing ◽  
Wave Phase

scholarly journals Interplay between Kelvin–Helmholtz and lower-hybrid drift instabilities

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
Jérémy Dargent ◽  
Federico Lavorenti ◽  
Francesco Califano ◽  
Pierre Henri ◽  
Francesco Pucci ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Density Gradient ◽  
Boundary Layers ◽  
Complex Dynamics ◽  
Two Dimensions ◽  
Velocity Shear ◽  
Lower Hybrid ◽  
Spatial And Temporal Scales ◽  
Inverse Cascade ◽  
Nonlinear Phase

Boundary layers in space and astrophysical plasmas are the location of complex dynamics where different mechanisms coexist and compete, eventually leading to plasma mixing. In this work, we present fully kinetic particle-in-cell simulations of different boundary layers characterized by the following main ingredients: a velocity shear, a density gradient and a magnetic gradient localized at the same position. In particular, the presence of a density gradient drives the development of the lower-hybrid drift instability (LHDI), which competes with the Kelvin–Helmholtz instability (KHI) in the development of the boundary layer. Depending on the density gradient, the LHDI can even dominate the dynamics of the layer. Because these two instabilities grow on different spatial and temporal scales, when the LHDI develops faster than the KHI an inverse cascade is generated, at least in two dimensions. This inverse cascade, starting at the LHDI kinetic scales, generates structures at scale lengths at which the KHI would typically develop. When that is the case, those structures can suppress the KHI itself because they significantly affect the underlying velocity shear gradient. We conclude that, depending on the density gradient, the velocity jump and the width of the boundary layer, the LHDI in its nonlinear phase can become the primary instability for plasma mixing. These numerical simulations show that the LHDI is likely to be a dominant process at the magnetopause of Mercury. These results are expected to be of direct impact to the interpretation of the forthcoming BepiColombo observations.

Langmuir wave phase-mixing in warm electron-positron-dusty plasmas

2018 ◽  
Vol 382 (15) ◽  
pp. 1020-1023 ◽  
Author(s):  
Sourav Pramanik ◽  
Chandan Maity
Keyword(s):  
Langmuir Wave ◽  
Dusty Plasmas ◽  
Phase Mixing ◽  
Wave Phase ◽  
Electron Positron
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