Moreton waves occur preferentially in flares with inclined, asymmetric magnetic fields and propagate toward the direction of fastest decrease in horizontal fast-mode wave speed.
Cyan and red contours show the HMI line-of-sight magnetic field with ± 200 G
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The magnetic origin of the mystery of rare H$\alpha$ Moreton waves
Moreton waves occur preferentially in flares with inclined, asymmetric magnetic fields and propagate toward the direction of fastest decrease in horizontal fast-mode wave speed.