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

TL;DR

This study analyzes the three-dimensional propagation of a global EUV wave and its chromospheric counterpart during a significant solar eruption, revealing detailed kinematics, temperature changes, and the wave's 3D structure using multi-wavelength and dual-perspective observations.

Contribution

It provides the first detailed 3D analysis of a global EUV wave and its chromospheric counterpart, combining multi-wavelength data and dual perspectives to understand wave propagation and structure.

Findings

EUV wave propagates circularly with initial velocity 600-720 km/s

Wave heats local coronal plasma from log(T/K)=5.9 to 6.2

Wavefront likely propagates at a tilt angle of ~53.2° to the solar surface

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$\alpha$ and EUV passbands with different characteristic temperatures. In the 171 {\AA} and 193/195 {\AA} 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$\alpha$ and 304 {\AA} 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.