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Fig. 1.


Identification of RBEs in Hα and Ca II K. Top row: blue wing Hα (a) and Ca II K (b) spectroheliograms, and the same region color-coded in terms of RP indexing (c). Small insets zoom in on a selected RBE with a cross symbol marking the location for the profiles shown in blue in (e) and (h), and the spectral evolution λt-slices (f) and (i). The corresponding RP profiles are shown in (d) and (g). The blue marker in (f) and (i) indicates the time t0 = 09:49:57 UTC. Reference quiet Sun profiles (RP−43) are shown as dashed lines.

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