Simultaneous transverse oscillations of a coronal loop and a filament excited by a circular-ribbon flare

Abstract

To investigate the excitation of kink oscillations in coronal loops and filaments, a C3.4 circular-ribbon flare (CRF) associated with a blowout jet in active region 12434 on 2015 October 16 is analyzed. The flare excited small-amplitude kink oscillation of a remote coronal loop. The oscillation lasted for $\ge$4 cycles without significant damping. The amplitude and period are 0.3$\pm$0.1 Mm and 207$\pm$12 s. Interestingly, the flare also excited transverse oscillation of a remote filament. The oscillation lasted for $\sim$3.5 cycles with decaying amplitudes. The initial amplitude is 1.7$-$2.2 Mm. The period and damping time are 437$-$475 s and 1142$-$1600 s. The starting times of simultaneous oscillations of coronal loop and filament were concurrent with the hard X-ray peak time. Though small in size and short in lifetime, the flare set off a chain reaction. It generated a bright secondary flare ribbon (SFR) in the chromosphere, remote brightening (RB) that was cospatial with the filament, and intermittent, jet-like flow propagating in the northeast direction. The loop oscillation is most probably excited by the flare-induced blast wave at a speed of $\ge$1300 km s${}^{-1}$. The excitation of the filament oscillation is more complicated. The blast wave triggers secondary magnetic reconnection far from the main flare, which not only heats the local plasma to higher temperatures (SFR and RB), but produces jet-like flow (i.e., reconnection outflow) as well. The filament is disturbed by the secondary magnetic reconnection and experiences transverse oscillation. The findings give new insight into the excitation of transverse oscillations of coronal loops and filaments.

arXiv comment7 pages, 9 figures, 2 tables, accepted for publication in A&A

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• A Statistical Study of Short-period Decayless Oscillations of Coronal Loops in an Active Region
• Transverse Coronal-Loop Oscillations Induced by the Non-radial Eruption of a Magnetic Flux Rope
• Spectroscopic observations of a flare-related coronal jet
• Traveling kink oscillations of coronal loops launched by a solar flare
• Detections of Multi-Periodic Oscillations during a Circular Ribbon Flare
• Statistical analysis of circular-ribbon flares
• Transverse oscillation of a coronal loop induced by a flare-related jet
• Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets
• Do Coronal Loops Oscillate in Isolation?