Excitation Of Magnetohydrodynamic Waves By Plasmoids Ejection In The Solar Corona

摘要

In this study, we numerically investigate the excitation of MHD waves in the interchange reconnection scenario in the solar corona. The modeling results show that as a result of tearing instability, the magnetic reconnection occurs, accompanying the creation of plasmoids. The created plasmoids are quickly shot, and strongly collide with the magnetic field in the outflow regions, which consecutively triggers the perturbations of velocity component V_x, V_y, and V_z. The perturbations of V_y satisfy the polarity relations of slow-mode wave, and their propagating speed approaches the sonic speed in the model, while the perturbations of V_z satisfy the polarity relations of Alfvén wave, and their propagating speed is about the Alfvén speed, thus verifying that they are slow-mode waves and Alfvén waves, respectively. These simulation results indicate that not only fast-mode wave but also slow-mode wave and Alfvén wave can be simultaneously excited by plasmoid ejections and releases.