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• W2066442746 abstract "Observations indicate that the current sheet in the Earth’s geomagnetic tail may compress to a thickness comparable to an ion gyro-radius prior to substorm onset. In recent years, there has been considerable controversy regarding the kinetic stability of these thin structures. In particular, the growth rate of the kink instability and its relevance to magnetotail dynamics is still being debated. In this work, a series of fully kinetic particle-in-cell simulations are performed for a thin Harris sheet. The ion to electron mass ratio is varied between mi/me=4→400 and careful comparisons are made with a formally exact approach to the linear Vlasov theory. At low mass ratio mi/me<64, the simulations are in excellent agreement with the linear theory, but at high mass ratio the kink instability is observed to grow more rapidly in the kinetic simulations than predicted by theory. The resolution to this apparent discrepancy involves the lower hybrid instability which is active on the edge of the sheet and rapidly produces nonlinear modifications to the initial equilibrium. The nature of this nonlinear deformation is characterized and a simple model is proposed to explain the physics. After the growth and saturation of the lower hybrid fluctuations, the deformed current sheet is similar in structure to a Harris equilibrium with an additional background population. This may explain the large growth rate of the kink instability at later times, since this type of modification to the Harris sheet has been shown to greatly enhance the growth rate of the kink mode." @default.
• W2066442746 created "2016-06-24" @default.
• W2066442746 creator A5082191422 @default.
• W2066442746 date "2002-09-01" @default.
• W2066442746 modified "2023-09-26" @default.
• W2066442746 title "Nonlinear dynamics of thin current sheets" @default.
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• W2066442746 doi "https://doi.org/10.1063/1.1499118" @default.
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