Total reflection of a flare-driven quasi-periodic extreme ultraviolet wave train at a coronal hole boundary^⋆

¹ Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, PR China
e-mail: ydshen@ynao.ac.cn
² State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, PR China
³ University of Chinese Academy of Sciences, Beijing, PR China

Received: 27 October 2021
Accepted: 29 December 2021

Abstract

Context. A flare-driven quasi-periodic extreme ultraviolet wave train totally reflected at a coronal hole boundary was well imaged on both temporal and spatial scales by AIA/SDO.

Aims. We aim to investigate the driving mechanisms of the quasi-periodic wave train and demonstrate the total reflection effect at the coronal hole boundary.

Methods. The speeds of the incident and reflected wave trains are studied. The periodic correlation of the wave trains with the related flare is probed. We compare the measured incidence angle and the estimated critical angle.

Results. We find that the periods of the incident and reflected wave trains are both about 100 s. The excitation of the quasi-periodic wave train was possibly due to the intermittent energy release in the associated flare since its period is similar to that of the quasi-periodic pulsations in the associated flare. Our observational results show that the reflection of the wave train at the boundary of the coronal hole was a total reflection because the measured incidence and critical angles satisfy the theory of total reflection: the incidence angle is smaller than the critical angle.