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Evolution vs. time of the intensity in the Mg II k and in the 2832 Å ranges. Top panel: IRIS spectra of the Mg II band along slit position 1. The two wavelength regions in Mg II k line (left) and in the Balmer emission (right) are bounded by vertical blue lines. Bottom panels: temporal evolution of the relative contribution of Mg II k line (b, d) and Balmer continuum emission (c, e) at the reconnection point of the flare (y = 80). Panels c and d: the intensity (DN) has been divided by the transmission factor f(λ) of the 2832 filter taken from Kleint et al. (2017). The comparison of the relative peak values at the flare time in Mg II range (panel c) and continuum region (panel d) indicates the prevalence of the Balmer continuum.
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