Evolution of brightness temperature with propagating shock waves. (a) Variation of the initial wave amplitude Ai between 0.5% and 5% times the local sound speed at the lower boundary (v0). The periodicity is kept at 150 s. (b) Variation of the wave periodicity between 60 and 240 s, where Ai is kept at 0.01 v0. The orange graph in panels a and b represents the same run; in both panels, the case of a static atmosphere without any disturbances is plotted as reference with a gray dotted line. The runs are shifted in time to align the time of their peaks.
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