French, Ryan ; Kazachenko, Maria ; Berghmans, David ; D'Huys, Elke ; Dominique, Marie ; Talpeanu, Dana

Poster presented at 246th Meeting of the American Astronomical Society, Anchorage/Alaska on 2025-06-08

Abstract: We 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 EUV (HRIEUV), we find small-scale bead-like kernel structures propagating along the end of the flare ribbon during the impulsive phase of an M-class solar flare. These bead structures are dynamic, with well-resolved spatial separations of ≈800 kilometers – well below the observable limit of full-disk solar imagers. We analyze the evolution of the plane-of-sky velocity, size and separation of the flare ribbon structures, as well as the power distribution of the features along the ribbon. Finally, we compare these observables with different models of magnetic reconnection instabilities, to probe the processes triggering flare onset.

Keyword(s): Solar Orbiter ; EUI ; flare
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