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Fig. 7.

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Flare intensity distribution in the IRIS Mg II wavelength band at the flare time (02:04:28 UT). Panel a: full spectra of the Mg II band between λ = 2784 Å and λ = 2835 Å (50 Å) at the position of slit 1. Two dashed horizontal black lines indicate the coordinates y = 70 and y = 80 at the location of the maximum of the Balmer continuum in the spectral image. Panel b: spectral profile in the full range of the IRIS Mg II wavelength band at the two positions (y = 70 and 80 pixels). Panels c and d: zoom of two spectral profiles of panel b at (y = 70, 80) located at the two extremities of the wavelength band (dw1, dw2) indicated by two vertical cyan lines and two cyan arrows at the top of panel a right and left in the panel. Panels e and f: similar zoom spectra in the two continuum regions at the preflare time (01:43:41). Panels g and h: difference in intensity (Δ(Intensity)) between the intensity at the flare time (02:04:28 UT) and at the preflare time (01:43:41 UT). The intensity is calibrated to the c.g.s. units, i.e., erg s−1 sr−1 cm−2 Å−1.

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