Phase differences between Ca II and H alpha velocities reveal that umbral chromospheric oscillations are mostly standing, with propagating waves only where umbral flashes are frequent, confirming a resonant cavity.
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Observations of umbral flashes in the resonant sunspot chromosphere
Phase differences between Ca II and H alpha velocities reveal that umbral chromospheric oscillations are mostly standing, with propagating waves only where umbral flashes are frequent, confirming a resonant cavity.