000007703 001__ 7703
000007703 005__ 20260105155525.0
000007703 0247_ $$2DOI$$a10.3847/2041-8213/ae2684
000007703 037__ $$aSCART-2026-0011
000007703 100__ $$aFrench, Ryan J. 
000007703 245__ $$aEvolution of Flare Ribbon Bead-like Structures in a Solar Flare
000007703 260__ $$c2025
000007703 520__ $$aWe present fast-cadence and high-resolution observations of flare ribbons from the Solar Orbiter Extreme Ultraviolet Imager (EUI). Utilizing the short-exposure observations from the EUI High Resolution Imager in the extreme-ultraviolet, we find small-scale blob/bead-like kernel structures propagating within a hook at the end of a flare ribbon, during the impulsive phase of a C9.9-class solar flare. These bead structures are dynamic, with well-resolved spatial separations as low as ≈420–840 km (3–6 pixels) below the observable limit of full-disk solar imagers. We analyze the evolution of the plane-of-sky apparent velocity and separation of the flare ribbon structures, finding evidence for multiple processes occurring simultaneously within the flare ribbon. These processes include quasiperiodic pulsation–like brightenings, slow back-and-forth zigzag motions along the ribbon, rapid apparent motions along the ribbon (600+ km s−1), and stationary blob-like structures. Finally, we conduct fast Fourier transform analysis and analyze the start times of exponential growth in the power spectrum at different spatial scales across the flare ribbon. Our analysis reveals that the ribbon beads form with a key spatial separation of 1.7–1.9 Mm before developing into more complex structures at progressively larger and smaller spatial scales. This observation is consistent with predictions of the tearing mode instability.
000007703 594__ $$aSTCE
000007703 6531_ $$aSolar Orbiter
000007703 6531_ $$aEUI
000007703 6531_ $$aflare
000007703 700__ $$aKazachenko, Maria D. 
000007703 700__ $$aBerghmans, David
000007703 700__ $$aD'Huys, Elke 
000007703 700__ $$aDominique, Marie
000007703 700__ $$aPatel, Ritesh
000007703 700__ $$aTalpeanu, Dana-Camelia
000007703 700__ $$aTamburri, Cole A.
000007703 700__ $$aYadav, Rahul
000007703 773__ $$n2, id.L54$$pThe Astrophysical Journal Letters$$v995$$y2025
000007703 8560_ $$fdavid.berghmans@ksb-orb.be
000007703 85642 $$ahttps://arxiv.org/abs/2512.00710
000007703 85642 $$ahttps://iopscience.iop.org/article/10.3847/2041-8213/ae2684
000007703 905__ $$apublished in
000007703 980__ $$aREFERD