Solar Orbiter reveals persistent magnetic reconnection in medium-scale filament eruptions
Song Tan, Alexander Warmuth, Frédéric Schuller, Yuandeng Shen, Daniel F. Ryan, Daniele Calchetti, Johann Hirzberger, Takayoshi Oba, Artem Ulyanov, Gherardo Valori
Published: 2025/9/5
Abstract
Solar filament eruptions play a key role in driving space weather, yet their fine-scale evolution remains poorly understood due to observational limitations. Using unprecedented high-resolution observations from Solar Orbiter's Extreme Ultraviolet Imager (105 km/pixel) and Polarimetric and Helioseismic Imager, we reveal persistent magnetic reconnection events in a failed filament eruption. We identify magnetic reconnections between the filament and surrounding magnetic field structures, with both frequency and type far exceeding previous observations. These reconnections significantly affect the filament stability and eruption dynamics, leading to sequential coronal jets and failed eruptions. We propose a 'persistent magnetic cutting' concept, highlighting how persistent small-scale magnetic reconnections cumulatively affect filament stability during its evolution.