Kumar, Pankaj, Nakariakov, Valery M., Karpen, Judith T., DeVore, C. Richard and Cho, Kyung-Suk (2022) Kink oscillation of a flux rope during a failed solar eruption. Astrophysical Journal, 932 (1). L9. doi:10.3847/2041-8213/ac6e3e ISSN 0004-637X.

Preview

PDF WRAP-Kink-oscillation-flux-rope-failed-solar-eruption-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (3438Kb) | Preview

Request Changes to record.

Abstract

We report a decaying kink oscillation of a flux rope during a confined eruptive flare, observed off the solar limb by the Solar Dynamics Observatory's Atmospheric Imaging Assembly (AIA), which 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 Å, 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, a period of about 16 minutes, and a decay time of about 17 minutes. 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 differential emission measure 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 nonhorizontal 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Solar oscillations -- Research, Sun -- Active regions, Helioseismology, Magnetohydrodynamics, Plasma dynamics, Solar flares, X-ray spectroscopy
Journal or Publication Title:	Astrophysical Journal
Publisher:	IOP Publishing
ISSN:	0004-637X
Official Date:	13 June 2022
Dates:	Date Event 13 June 2022 Published 6 May 2022 Accepted
Volume:	932
Number:	1
Number of Pages:	11
Article Number:	L9
DOI:	10.3847/2041-8213/ac6e3e
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Copyright Holders:	© 2022. The Author(s). Published by the American Astronomical Society.
Date of first compliant deposit:	8 July 2022
Date of first compliant Open Access:	8 July 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID ST/T000252/1 [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 #80NSSC20K0265 NASA’s Heliophysics Guest Investigator UNSPECIFIED UNSPECIFIED Goddard Space Flight Center http://dx.doi.org/10.13039/100006198
Related URLs:	Publisher

Request changes or add full text files to a record

Repository staff actions (login required)

View Item

Downloads