Speaker
Description
First Name: Song
Last Name: Tan
Affiliation: Leibniz Institute for Astrophysics Potsdam (AIP)
All Authors: Song Tan, Alexander Warmuth, Frédéric Schuller, Yuandeng Shen, Daniel F. Ryan5, Daniele Calchetti, Johann Hirzberger, Takayoshi Oba, Artem Ulyanov, Gherardo Valori, Jake A. J. Mitchell and Fanpeng Shi
Abstract: As part of Solar Orbiter's 2024 Major Flare campaign, coordinated EUI/HRI and STIX observations during April and September perihelia provided unprecedented insights into magnetic reconnection dynamics in filament eruptions. EUI/HRI operated with up to 2-second cadence and 105 km/pixel spatial resolution, revealing previously unresolvable fine-scale structures, while STIX provided associated hard X-ray spectroscopy and imaging. We discovered persistent small-scale reconnection events throughout a medium-scale filament eruption on April 5, 2024, introducing the "persistent magnetic cutting" concept – a continuous cumulative process distinct from traditional catastrophic reconnection. We also identified extremely dynamic and transient jets (median lifetime: 22 seconds) on September 30, 2024, approximately 35 times shorter-lived than conventional jets. These jets evolved systematically through eruption phases with velocities increasing from ~85 km/s to ~525 km/s. STIX observations revealed two distinct energy release phases before and during the eruptions, tracing energy release and particle acceleration associated with magnetic reconnection.