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Fig. 5.


Forward modeling of Hα, Ca II K, and Mg II k spectra using the RH1.5D code. Top row: synthetic RBE-like profiles with a negative line-of-sight (LOS) velocity stratification with a minimum velocity of −30 (blue), −25 (red), and −20 (black) km s−1. Bottom row: synthetic RRE-like profiles modeled in the same way as the RBEs except for the positive velocity stratification with a maximum velocity of +30 (blue), +25 (red), and +20 (black) km s−1, respectively. The dashed black lines show the spectra with zero velocity in all the three wavelengths.

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