Three-dimensional Propagation of the Global EUV Wave associated with a solar eruption on 2021 October 28

Abstract

We present a case study for the global extreme ultraviolet (EUV) wave and its chromospheric counterpart `Moreton-Ramsey wave' associated with the second X-class flare in Solar Cycle 25 and a halo coronal mass ejection (CME). The EUV wave was observed in the H$\hat{I}\pm$ and EUV passbands with different characteristic temperatures. In the 171 Ã and 193/195 Ã images, the wave propagates circularly with an initial velocity of 600-720 km s${}^{-1}$ and a deceleration of 110-320 m s${}^{-2}$. The local coronal plasma is heated from log(T/K)=5.9 to log(T/K)=6.2 during the passage of the wavefront. The H$\hat{I}\pm$ and 304 Ã images also reveal signatures of wave propagation with a velocity of 310-540 km s${}^{-1}$. With multi-wavelength and dual-perspective observations, we found that the wavefront likely propagates forwardly inclined to the solar surface with a tilt angle of ~53.2${}^{\circ }$. Our results suggest that this EUV wave is a fast-mode magnetohydrodynamic wave or shock driven by the expansion of the associated CME, whose wavefront is likely a dome-shaped structure that could impact the upper chromosphere, transition region and corona.

Accepted by ApJ, 15 pages, and 7 figures