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- Raadu, Michael, et al.
(författare)
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Charge fluctuation effects on solitary waves in dusty plasmas
- 2005
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Ingår i: New Vistas in Dusty Plasmas. - : AIP. - 0735402876 ; , s. 486-489
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Konferensbidrag (refereegranskat)abstract
- In a dusty plasma the charge on a moving dust grain changes in response to the variations in the local plasma conditions. The charge on a slowly moving grain should be close to a locally determined equilibrium. For a time independent electrostatic structure an integral of motion for a grain with varying charge can then be found. Solutions of Vlasov's equation are given by arbitrary functions of these integrals of motion, so that, using the Poisson equation, a generalised Sagdeev (Classical) potential can be found (Raadu, 2003, Phys. Scripta vol.68, 266). Solitary wave solutions may be investigated making use of this generalised Sagdeev potential. The influence of charge fluctuations on the range of parameters for the existence of solitary waves is considered here. A modified form of the relation between the amplitude and the wave velocity is found.
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| 2. |
- Shafiq, Mohammad, et al.
(författare)
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Energy loss of test charges in a dusty plasma in the presence of dynamical grain charging, in New Vistas in Dusty Plasmas
- 2005
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Ingår i: New Vistas in Dusty Plasmas. - : AIP. - 0735402876 ; , s. 490-493
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Konferensbidrag (refereegranskat)abstract
- Thedynamical charging of dust grains is an important process andis found to enhance the shielding of a test chargepassing through a multi-component dusty plasma. In the present work,the energy loss of a test charge projectile passing througha dusty plasma in the presence of dynamical grain chargingis studied. The electric forces can be written in termsof the Maxwell stress tensor for a sphere around thetest charge. For sphere with radius tending to zero theforce is just that on the test charge. For afinite radius, forces on the plasma are also included whichmakes it possible to see how the force on thetest charge is balanced by the force on the plasma.The method fails for the zero radius but the dragforce can be found from a simple physical model. Thegeneral analytical results are presented and are compared with theprevious results.
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| 3. |
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