2025/02/23 by Yining Zhang, Zhang, Yining, Ting Li +9 · 1 voice · 4 citations
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Ocean Waves and Remote Sensing #Solar and Space Plasma Dynamics #Structural Analysis and Optimization #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.2502.16579
The apparent slipping motion of flare loops is regarded as a key feature of the 3D magnetic reconnection in the solar flares. The slippage with a super-Alfvénic speed could be defined as slipping-running reconnection while the slippage with a sub-Alfvénic speed is called slipping reconnection. Due to the limitation of the observational instrument temporal resolution, the apparent slippage of the flare loop footpoints along the flare ribbons with super-Alfvénic speed is quite rare to our knowledge. In this paper, we report a unique event that exhibits not only the sub-Alfvénic slippage, but also the quasiperiodic super-Alfvénic slippage of ribbon substructures during a C3.4-class flare (SOL2023-01-18-T15:23), using the high temporal resolution observations of the Interface Region Imaging Spectrograph (∼2 s). The super-Alfvénic slippage with a speed of up to ∼ 1688 km s-1 is directly observed in this study. The calculated period of the apparent super-Alfvénic slippage in both ribbons is between 8.4 and 11.9 seconds. This work provides the first observational evidence of the periodicity for the slipping-running magnetic reconnection.