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Kink Oscillation of a Flux Rope During a Failed Solar Eruption View all abstracts by submitter

Pankaj Kumar   Submitted: 2022-05-10 15:09

We report a decaying kink oscillation of a flux rope during a confined eruptive flare, observed off the solar limb by SDO/AIA, that lacked a detectable white-light coronal mass ejection. The erupting flux rope underwent kinking, rotation, and apparent leg-leg interaction during the event. The oscillations were observed simultaneously in multiple AIA channels at 304, 171, and 193 , indicating that multithermal plasma was entrained in the rope. After reaching the overlying loops in the active region, the flux rope exhibited large-amplitude, decaying kink oscillations with an apparent initial amplitude of 30 Mm, period of about 16 min, and decay time of about 17 min. We interpret these oscillations as a fundamental standing kink mode of the flux rope. The oscillation polarization has a clear vertical component, while the departure of the detected waveform from a sinusoidal signal suggests that the oscillation could be circularly or elliptically polarized. The estimated kink speed is 1080 km s-1, corresponding to an Alfvén speed of about 760 km s-1. This speed, together with the estimated electron density in the rope from our DEM analysis, ne≈ (1.5-2.0)109 cm-3 , yields a magnetic field strength of about 15 G. To the best of our knowledge, decaying kink oscillations of a flux rope with non-horizontal polarization during a confined eruptive flare have not been reported before. These oscillations provide unique opportunities for indirect measurements of the magnetic-field strength in low-coronal flux ropes during failed eruptions.

Authors: Pankaj Kumar, Valery M. Nakariakov, Judith T. Karpen, C. Richard DeVore, Kyung-Suk Cho
Projects: None

Publication Status: ApJ Letters (in press)
Last Modified: 2022-05-11 12:28
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