Resolved magnetohydrodynamic wave lensing in the solar corona

Resolved magnetohydrodynamic wave lensing in the solar corona

16 April 2024 | Xinping Zhou, Yuandeng Shen, Ding Yuan, Rony Keppens, Xiaozhou Zhao, Libo Fu, Zehao Tang, Jiaoyang Wang, Chengrui Zhou
This study reports the observation of magnetohydrodynamic (MHD) wave lensing in the solar corona, where quasi-periodic wave-fronts from a flare converge at a specific point after passing through a coronal hole (CH). The entire process, from the source to the focus, resembles electromagnetic wave lensing. High spatio-temporal resolution observations from the Solar Dynamics Observatory (SDO) confirmed the lensing effect, and numerical simulations reproduced the observed phenomenon. The lensing process encodes information on the Alfvén speed and density variations, making it potentially useful for coronal seismology. The study highlights the importance of CH geometry and Alfvén speed in focusing MHD waves, providing insights into the dynamics of the solar corona.This study reports the observation of magnetohydrodynamic (MHD) wave lensing in the solar corona, where quasi-periodic wave-fronts from a flare converge at a specific point after passing through a coronal hole (CH). The entire process, from the source to the focus, resembles electromagnetic wave lensing. High spatio-temporal resolution observations from the Solar Dynamics Observatory (SDO) confirmed the lensing effect, and numerical simulations reproduced the observed phenomenon. The lensing process encodes information on the Alfvén speed and density variations, making it potentially useful for coronal seismology. The study highlights the importance of CH geometry and Alfvén speed in focusing MHD waves, providing insights into the dynamics of the solar corona.
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[slides and audio] Resolved magnetohydrodynamic wave lensing in the solar corona