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Oscillation of a small Hα surge in a solar polar coronal hole View all abstracts by submitter

Valery Nakariakov   Submitted: 2019-06-10 03:17

Hα surges(i.e., cool/dense collimated plasma ejections) may act as a guide for the propagation of magnetohydrodynamic waves. We report a high-resolution observation of a surge observed with 1.6 m Goode Solar Telescope (GST) on 2009 August 26, from 18:20 UT to 18:45 UT. Characteristics of plasma motions in the surge are determined with the normalizing radial gradient filter and the Fourier motion filter. The shape of the surgeis found to change from a"C" shape to an inverse "C" shape after a formation of a cusp, a signature ofreconnection. There are apparent upflows seen above the cusp top and downflows below it. The upflows showrising and rotational motions in the right-hand direction, with the rotational speed decreasing with height. Near thecusp top, wefind a transverse oscillation of the surge, with the period of ∼2 minutes. There is no change of theoscillation phase below the cusp top, but above the top a phase change is identified, giving a vertical phase speedabout 86 km s-1. As the height increases, the initial amplitude of the oscillation increases, and the oscillationdamping time decreases from 5.13 to 1.18 minutes. We conclude that the oscillation is a propagating kink wavethat is possibly excited by the repetitive spontaneous magnetic reconnection.

Authors: Cho, K.-S., Cho, I.-H., Nakariakov, V.M., Yurchyshyn, V.B., Yang, H., Kim, Y.-H., Kumar, P., Magara, T.
Projects: None

Publication Status: Astrophysical Journal Letters, 877, L1, 2019
Last Modified: 2019-06-12 12:21
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