Current-sheet Oscillations Caused by the Kelvin-Helmholtz Instability at the 
Loop Top of Solar Flares

Wang, W.Y.; Cheng, Xin; Ren, Z.N.; Ding, M.D.

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Current-sheet Oscillations Caused by the Kelvin-Helmholtz Instability at the Loop Top of Solar Flares

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Cheng, Xin
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Wang, W., Cheng, X., Ren, Z., & Ding, M. (2022). Current-sheet Oscillations Caused by the Kelvin-Helmholtz Instability at the Loop Top of Solar Flares. Astrophysical Journal Letters, 931(2).

Cite as: https://hdl.handle.net/21.11116/0000-000C-B8C8-3

Abstract

Current sheets (CSs), long stretching structures of magnetic reconnection above solar flare loops, are usually observed to oscillate; their origins, however, are still puzzled at present. Based on a high-resolution 2.5D MHD simulation of magnetic reconnection, we explore the formation mechanism of CS oscillations. We find that large-amplitude transverse waves are excited by the Kelvin-Helmholtz instability at the highly turbulent cusp-shaped region. The perturbations propagate upward along the CS with a phase speed close to local Alfven speed thus resulting in the CS oscillations we observe. Though the perturbations damp after propagating for a long distance, the CS oscillations are still detectable. In terms of detected CS oscillations, with a combination of differential emission measure techniques, we propose a new method for measuring the magnetic field strength of the CS and its distribution in height.