The existence of stationary ion-acoustic double layers in a plasma with an electron beam

1996 ◽  
Vol 235 (2) ◽  
pp. 245-253 ◽  
Author(s):  
Yasunori Nejoh
Keyword(s):  
Electron Beam ◽  
Double Layers ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers

Ion acoustic double layers forming behind irradiated solid objects in streaming plasmas

2010 ◽  
Vol 76 (3-4) ◽  
pp. 429-439 ◽  
Author(s):  
W. J. MILOCH ◽  
V. L. REKAA ◽  
H. L. PÉCSELI ◽  
J. TRULSEN
Keyword(s):  
Numerical Simulations ◽  
Uv Light ◽  
Three Dimensional ◽  
Double Layers ◽  
Back Side ◽  
Electron Population ◽  
Von Neumann ◽  
Solid Objects ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers

AbstractSmall solid metallic objects in relative motion to thermal plasmas are studied by numerical simulations. We analyze supersonic motions, where a distinctive ion wake is formed behind obstacles. At these plasma drift velocities, ions enter the wake predominantly due to deflections by the electric field in the sheath around the obstacle. By irradiating the back side of the object by ultraviolet (UV) light, we can induce also an enhanced photo-electron population there. The resulting charge distribution gives rise to a pronounced local potential and plasma density well behind the object. This potential variation has the form of a three-dimensional ion acoustic double layer, containing also an ion phase space vortex. The analysis is supported also by one-dimensional numerical simulations to illustrate the importance of boundary conditions, Dirichlet and von Neumann conditions in particular.

A Model for Solar Flares Invoking Weak Double Layers

1989 ◽  
Vol 8 (1) ◽  
pp. 29-31 ◽  
Author(s):  
J. I. Khan
Keyword(s):  
Simple Model ◽  
Solar Flares ◽  
Source Region ◽  
High Energy ◽  
Double Layers ◽  
Ion Acoustic ◽  
Ion Acoustic Double Layers

AbstractA simple model for solar flares is described which invokes many ion-acoustic double layers in the source region. The ability of the model to explain some of the observed characteristics of solar flares is discussed, particular attention being paid to the well-observed high-energy flare examined by de Jager et al. (1987).

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