000008084 001__ 8084
000008084 005__ 20260319144158.0
000008084 037__ $$aCTALK-2026-0101
000008084 100__ $$aFrench, Ryan J.
000008084 245__ $$aEvolution of Flare Ribbon Bead-like Structures in a Solar Flare
000008084 260__ $$c2026
000008084 269__ $$c2026-03-18
000008084 520__ $$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 EUV (HRIEUV), 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 kilometers (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 – quasi-periodic pulsation (QPP)-like brightenings, slow back-and-forth zig-zag motions along the ribbon, rapid apparent motions along the ribbon (600+ km/s), 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.
000008084 594__ $$aNO
000008084 6531_ $$aEUI
000008084 6531_ $$asolar flares
000008084 700__ $$aKazachenko, Maria D.
000008084 700__ $$aBerghmans, David
000008084 700__ $$aD'Huys, Elke
000008084 700__ $$aDominique, Marie
000008084 700__ $$aPatel, Ritesh
000008084 700__ $$aTalpeanu, Dana
000008084 700__ $$aTamburri, Cole A.
000008084 700__ $$aYadav, Rahul
000008084 773__ $$t10th Solar Orbiter Workshop
000008084 8560_ $$fdavid.berghmans@ksb-orb.be
000008084 85642 $$ahttps://plan.events.mpg.de/event/453/contributions/2436/
000008084 906__ $$aContributed
000008084 980__ $$aCTALKCONT