Anomalous resistivity due to kink modes in a thin current sheet

Moritaka, Toseo; Horiuchi, Ritoku; Ohtani, Hiroaki

doi:doi:10.1063/1.2767623

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Nonlinear absorption of surface plasmons and emission of electrons from metallic targets

A large-amplitude surface plasma wave (SPW) over a metal-vacuum interface Ohmically heats the electrons and undergoes nonlinear absorption. The attenuation rate increases with the local SPW amplitude. The enhanced electron temperature leads to stronger thermionic emission of electrons. At typical Nd:glass laser intensity IL = 7 GW/cm2, if one takes the amplitude of the SPW to be ≈ 6 times the amplitude of the laser, one obtains the thermionic electron emission current density J = 200 A/cm2. Ho...

Soliton propagation in an inhomogeneous plasma at critical density of negative ions: Effects of gyratory and thermal motions of ions

The effects of gyratory and thermal motions of ions on soliton propagation in an inhomogeneous plasma that contains positive ions, negative ions, and electrons are studied at a critical density of negative ions. Since at this critical negative ion density the nonlinear term of the relevant Korteweg–deVries (KdV) equation vanishes, a higher order of nonlinearity is considered by retaining higher-order perturbation terms in the expansion of dependent quantities together with the appropriate set o...

The roles of microscopic plasma instabilities on the violation of the frozen-in constraint are investigated by examining the force balance equation based on explicit electromagnetic particle simulation for a thin current sheet. Wave-particle interactions associated with lower hybrid drift instability and drift kink instability (DKI) contribute to the wavy electric force term at the periphery of the current sheet and the wavy magnetic force term at the neutral sheet, respectively. In the linear growing phase of DKI, the wavy magnetic force term balances with the electric force term due to the dc electric field at the neutral sheet. It is concluded that the growth of DKI can create anomalous resistivity and result in the violation of the frozen-in constraint as well as the diffusion of current density.

Article Outline

INTRODUCTION
SIMULATION MODEL
SIMULATION RESULTS
1. Nonideal effects due to lower hybrid drift instability
2. Nonideal effects due to drift kink instability
3. Nonideal effect due to shorter kink instability
SUMMARY AND DISCUSSIONS

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KEYWORDS and PACS

Keywords

electrical resistivity, kink instability, magnetic reconnection, plasma magnetohydrodynamics, plasma simulation

PACS

52.35.Vd

Magnetic reconnection
52.65.-y

Plasma simulation

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.2767623

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1070-664X (print)

1089-7674 (online)

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American Institute of Physics

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