KU Leuven Centre for mathematical Plasma-Astrophysics Seminar
Title: Numerical Simulations of Large-Amplitude Oscillations in Solar Prominences
Speaker: Valeriia Liakh from CmPA
Abstract:
In this work, we focused on studying the properties of the large-amplitude prominence oscillations (LAOs) using the realistic prominence models and the triggering of such motions by external perturbations. LAOs involve motions with velocity amplitudes above 20 km/s, and large portions of the filament move in phase, indicating a strong connection with the magnetic field structure of the filament. Such motions are triggered by solar energetic events such as distant or nearby flares, jets, and eruptions. This study is based on time-dependent numerical simulations performed with the magnetohydrodynamic (MHD) code MANCHA3D. 2D and 2.5D numerical experiments allowed us to investigate three different aspects of the nature of LAOs. First, we investigated the restoring forces and relation of the period to the parameters of the global prominence structure. Second, we performed the convergence test when studying the damping mechanism of LALOs and found that numerical dissipation in low-resolution simulation hides the important amplification of LALOs. Finally, we performed important experiments proposing several scenarios to explain the triggering of different polarizations of LAOs involving the nearby eruption event or the energetic event mimicking a distant solar flare. These numerical experiments can serve as a basis for further investigation of the triggering mechanism of LAOs and propagation and interaction of the coronal perturbations with magnetic structures such as prominences.
The seminars are in hybrid mode, you can follow in person in room 200B 00.07 or online at the (permanent) link:
https://eu.bbcollab.com/guest/7406a5ec00dc4ec6948200f9c769d454
Date and time: Thursday, February 10, 2022 - 14:00 to 15:00
