Fig. 7: MHD simulation of fast magnetoacoustic-wave mode conversion at a magnetic null point.
From: Direct imaging of magnetohydrodynamic wave mode conversion near a 3D null point on the sun
a–c Selected panels display filled contour plots representing the absolute velocity values at three different times: during the arrival of the fast-mode wave (F), its wrapping around the null point, and the emergence of slow-mode waves (S, indicated by arrows). The spatial and time units are arbitrary. The black lines show selected magnetic field lines in the plane of the simulation. The solid and dashed black lines indicate the field lines in the opposite quadrants. The red circles show the β = 1 contour. For this simulation, ω = 1.2.
