Effects of dust-charge fluctuation on the damping of Alfvén waves in dusty plasmas

2005 ◽  
Vol 12 (5) ◽  
pp. 052109 ◽  
Author(s):  
M. C. de Juli ◽  
R. S. Schneider ◽  
L. F. Ziebell ◽  
V. Jatenco-Pereira
Keyword(s):  
Dusty Plasmas ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Charge Fluctuation ◽  
Dust Charge ◽  
Dust Charge Fluctuation

Kinetic Alfvén waves in a homogeneous dusty magnetoplasma with dust charge fluctuation effects

2007 ◽  
Vol 14 (3) ◽  
pp. 032105 ◽  
Author(s):  
K. Zubia ◽  
N. Rubab ◽  
H. A. Shah ◽  
M. Salimullah ◽  
G. Murtaza
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Charge Fluctuation ◽  
Dust Charge ◽  
Dust Charge Fluctuation ◽  
Fluctuation Effects ◽  
Kinetic Alfvén Waves

Drift–Alfvén vortices in dusty plasmas with non-zero ion-temperature effects

2000 ◽  
Vol 64 (4) ◽  
pp. 319-332 ◽  
Author(s):  
O. A. POKHOTELOV ◽  
O. G. ONISHCHENKO ◽  
P. K. SHUKLA ◽  
L. STENFLO
Keyword(s):  
Localization Length ◽  
Dusty Plasmas ◽  
Alfven Waves ◽  
Plasma Pressure ◽  
Skin Depth ◽  
Larmor Radius ◽  
Alfvén Waves ◽  
Charged Dust ◽  
Ion Temperature ◽  
Dust Charge

Reduced two-fluid equations governing the nonlinear dynamics of drift–Alfvén waves in dusty plasmas with non-zero ion temperature are derived. In the linear limit, we find a dispersion relation that shows the coupling between the ion-drift–Shukla–Varma mode, and electron-drift (magnetostatic) and (inertial or kinetic) Alfvén waves due to the finite collisionless electron skin depth or Larmorradius corrections. In contrast to the case of an electron–ion plasma, when the nonlinear drift–Alfvén vortices are weakly localized, i.e. decrease at infinity as r−1, the presence of the charged dust grains makes exponential localization possible. The physical meaning of such a localization is connected with the fact that charged massive dust granules provide an additional screening that results in stronger localization of the vortex. In several intermediate-β plasmas with 1 [Gt ] β [Gt ] me/mi (me,i is the electron or ion mass), the localization length approaches a minimum value when the vortex velocity is of the order of the ion diamagnetic drift. It then reaches the value ρiδ−1/4d where ρi is the ion Larmor radius and δd is the ratio of the dust to ion densities multiplied by the dust charge number Zd. In the case of very low plasma pressure, β [Lt ] me/mi, the vortex is localized with typical scale (λeρi)1/2δ−1/4d where λe is the electron skin depth. Our investigation can thus predict the velocities of coherent nonlinear structures in space plasmas.

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