On the influence of the local maxima of total pressure on the current sheet stability to the kink-like (flapping) mode

Описание

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1063/1.5016934

Аннотация: The stability of the Fadeev-like current sheet with respect to transversally propagating kink-like perturbations (flapping mode) is considered in terms of two-dimensional linear magnetohydrodynamic numerical simulations. It is found that the current sheet is stable when the total pressure minimum is located in the sheet center and Показать полностьюunstable when the maximum value is reached there. It is shown that an unstable spot of any size enforces the whole sheet to be unstable, though the increment of instability decreases with the reduction of the unstable domain. In unstable sheets, the dispersion curve of instability shows a good match with the double-gradient (DG) model prediction. Here, the typical growth rate (short-wavelength limit) is close to the DG estimate averaged over the unstable region. In stable configurations, the typical frequency matches the maximum DG estimate. The dispersion curve of oscillations demonstrates a local maximum at wavelength similar to 0.7 sheet half-width, which is a new feature that is absent in simplified analytical solutions. (C) 2018 Author(s).

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Издание

Журнал: PHYSICS OF PLASMAS

Выпуск журнала: Vol. 25, Is. 2

ISSN журнала: 1070664X

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

Авторы

  • Korovinskiy D.B. (Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria)
  • Erkaev N.V. (FRC Krasnoyarsk Sci Ctr SBRAS, Inst Computat Modelling, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Appl Mech Dept, Krasnoyarsk 660041, Russia)
  • Semenov V.S. (St Petersburg State Univ, Earth Phys Dept, Ulyanovskaya 1, Petrodvorets 198504, Russia)
  • Ivanov I.B. (Petersburg Nucl Phys Inst, Theoret Phys Div, Gatchina 188300, Russia)
  • Kiehas S.A. (Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria)
  • Ryzhkov I.I. (FRC Krasnoyarsk Sci Ctr SBRAS, Inst Computat Modelling, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Dept Appl Math & Comp Secur, Krasnoyarsk 660041, Russia)

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