Speaker
Description
First Name: Yuhao
Last Name: Chen
Affiliation: School of Earth and Space Sciences, Peking University, China
All Authors: Yuhao Chen, Chengcai Shen, Zhixing Mei, Jing Ye, Jialiang Hu, Zehao Tang, Guanchong Cheng, Shanshan Xu, Abdullah Zafar, Yujia Song, and Jun Lin
Abstract: Newly emerging flux (NEF) has been widely studied as a trigger of solar filament eruptions, but its influence on the subsequent dynamics remains poorly explored. Because NEF typically emerges adjacent to filaments, it imposes magnetic asymmetry that can drive non-radial eruptions and complicate space-weather forecasting. We bridge analytic catastrophe theory with 2D resistive MHD simulations: analytic solutions provide magnetic configurations containing a flux rope at the loss-of-equilibrium point, which are then used as initial conditions for simulations to examine the following dynamics. We find that NEF governs the kinematics of filament eruptions in two ways. First, by reshaping coronal stability, NEF can create or eliminate a higher equilibrium in corona, thereby producing failed eruptions or CMEs. In the transitional situation where a metastable equilibrium appears, the rising filament decelerates and stalls before re-accelerating into a CME, consistent with observed two-step eruptions. Second, by breaking symmetry, NEF deflects eruptions away from the radial direction: depending on its polarity, it acts as a repulsor or an attractor on eruptive filaments, and the deflection magnitude increases with the degree of asymmetry. Our theory yields two characteristic angles that predict the deflection directions of CMEs and failed eruptions, and simulations closely aligns with these predictors. These results highlight the NEF not only as a trigger but also as a key factor that governs both the acceleration and deflection of eruptions during their propagation in the low corona. The unique off-ecliptic perspective of Solar Orbiter, when combined with Earth-view observations, enables more precise reconstruction of the early deflection and acceleration of eruptive filaments. Such multi-viewpoint observations will not only validate and constrain our theoretical model but also provide more reliable physical bases for improving space-weather forecasts.