Simultaneous horizontal and vertical oscillations in a quiescent filament triggered by a extreme ultraviolet wave

Oscillation is a common and interesting phenomenon in the magnetized plasma environment of the solar corona that can be utilized to infer the embedded magnetic field strength. In this paper, we present the imaging and spectroscopic observation of the simultaneous horizontal and vertical oscillation of a mini filament on 21 April 2023. The oscillation was triggered by a large-scale extreme ultraviolet (EUV) wave associated with a large-scale filament eruption, which propagated outward with a circular wavefront. After traveling approximately 2.5×105 km in the solar corona, the wave impacted the mini-filament, inducing the simultaneous horizontal and vertical oscillation. We measured the oscillation parameters of the mini-filament using the EUV images: an amplitude of 9.1 Mm, a period of 1900 s (33 min), a damping time of 4500 s (75 min), and an horizontal velocity of about 23 km s−1. The maximum Doppler velocity of the oscillation filament were approximately 9.0 km s−1 (redshift) and 6.9 km s−1 (blueshift), which were derived from the spectroscopic data of Chines H α Solar Explorer/H α Imaging Spectrograph. The 3D initial velocity of the oscillation is determined to be about 24.6 km s−1. Using prominence seismology and these parameters, we estimated the magnetic field strength of the mini-filament to be approximately 6.8 Gauss. Additionally, we calculated the kinetic energies of the mini-filament and the incident wave to be about 1.0×1019 J and 9.0×1020 J, respectively.