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- Bingham, R, et al.
(författare)
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Coronal heating by dissipating current sheets
- 2004
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Ingår i: Physica scripta. T. - Bristol : Institute of Physics (IOP). - 0281-1847. ; T107, s. 247-249
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Tidskriftsartikel (refereegranskat)abstract
- It is shown that the lower-hybrid turbulence produced by the lower-hybrid-drift wave instability at current sheets can heat electrons and ions in the solar corona. The waves heat the plasma particles by collisionless Landau damping. The waves resonate with electrons moving in the direction of the magnetic field, while they resonate with ions moving in the perpendicular direction.
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| 2. |
- Dieckmann, Mark E, 1969-, et al.
(författare)
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Simulation study of a two stream instability with a beam gamma = 100
- 2004
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Ingår i: 33rd European Physical Society Conference of Plasma Physics,2006. - Rome : European Physical Society. ; , s. P2.049-
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Konferensbidrag (refereegranskat)abstract
- A better understanding of the relaxation of relativistic plasma flow is required to identify particle acceleration and radiation generation mechanisms at gamma ray bursts (GRBs). We perform particle-in-cell (PIC) simulations of the electrostatic two-stream instability for a beam speed VB with Gamma (v_b) = 100. The two p+e- beams are charge neutral and have comparable densities. The instability saturates by trapping the electrons of one beam and it modulates the electron density of the second beam. The electrostatic fields are compressed in the forming cavities to high intensities. The waves collapse, after which the electrons show an exponential tail that is eventually transformed into a power law tail.
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| 10. |
- Sandberg, Ingmar, 1974-
(författare)
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Drift and Mirror Modes in Magnetized Plasmas
- 2002
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Low frequency plasma instabilities driven by plasma inhomogeneity and velocity anisotropies are major candidates for the explanation of various phenomena observed in fusion and space plasmas. For low-β fusion plasma, the influence of plasma rotation and finite ion temperature on the structure and the type of toroidal drift eigenmodes in tokamaks is investigated rigorously, including the effects induced by the toroidal geometry such as the coupling mode, the radial variation of plasma rotation velocity and the magnetic shear. The conditions at which global or propagating drift modes are formed and the analytical dispersion relations are obtained for various cases. For high-β space plasma, a unified theory of the mirror instability based on a quasi-hydrodynamic approach and a unified fully kinetic theory of the drift mirror instabilities have been developed. The obtained results are applicable for arbitrary distribution functions and can be used to determine whether mirror and drift mirror modes are stable or unstable in a multi-component plasma, including electron temperature effects and electron pressure anisotropies. A major outcome of the theory of drift mirror instabilities, is the prediction of a hydrodynamic drift mirror instability with threshold lower than the classic ion drift mirror instability.
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