On the influence of the local maxima of total pressure on the current sheet stability to the kink-like (flapping) mode
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DOI:
10.1063/1.5016934URI (для ссылок/цитирований):
https://aip.scitation.org/doi/10.1063/1.5016934https://elib.sfu-kras.ru/handle/2311/110858
Автор:
Korovinskiy, D. B.
Erkaev, N. V.
Semenov, V. S.
Ivanov, I. B.
Kiehas, S. A.
Ryzhkov, I. I.
Коллективный автор:
Институт космических и информационных технологий
Политехнический институт
Кафедра прикладной математики и компьютерной безопасности
Кафедра прикладной механики
Дата:
2018-02Журнал:
Physics of PlasmasКвартиль журнала в Scopus:
Q2Квартиль журнала в Web of Science:
Q3Библиографическое описание:
Korovinskiy, D. B. On the influence of the local maxima of total pressure on the current sheet stability to the kink-like (flapping) mode [Текст] / D. B. Korovinskiy, N. V. Erkaev, V. S. Semenov, I. B. Ivanov, S. A. Kiehas, I. I. Ryzhkov // Physics of Plasmas. — 2018. — Т. 25 (№ 2). — С. 022904Аннотация:
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 unstable 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 0:7 sheet half-width, which is a new feature that is absent in simplified analytical
solutions.