Numerical Simulation of Coronal Waves Interacting with Coronal Holes. III. Dependence on Initial Amplitude of the Incoming Wave

作者：Piantschitsch Isabell^*; Vrsnak Bojan; Hanslmeier Arnold; Lemmerer Birgit; Veronig Astrid; Hernandez Perez Aaron; Calogovic Jasa

来源：Astrophysical Journal, 2018, 860(1): 24.

DOI：10.3847/1538-4357/aabe7f

• magnetohydrodynamics (MHD)
• Sun: corona
• Sun: evolution
• waves

We performed 2.5D magnetohydrodynamic (MHD) simulations showing the propagation of fast-mode MHD waves of different initial amplitudes and their interaction with a coronal hole (CH), using our newly developed numerical code. We find that this interaction results in, first, the formation of reflected, traversing, and transmitted waves (collectively, secondary waves) and, second, in the appearance of stationary features at the CH boundary. Moreover, we observe a density depletion that is moving in the opposite direction of the incoming wave. We find a correlation between the initial amplitude of the incoming wave and the amplitudes of the secondary waves as well as the peak values of the stationary features. Additionally, we compare the phase speed of the secondary waves and the lifetime of the stationary features to observations. Both effects obtained in the simulation, the evolution of secondary waves, as well as the formation of stationary fronts at the CH boundary, strongly support the theory that coronal waves are fast-mode MHD waves.

• 出版日期2018-6-10