The top panel compares a flaring spectrum vs. a normal spectrum of Alpha Centauri A as observed by IUE. The difference in flux is more noticeable in the shorter-wavelength regime labeled as photosphere 1. The bottom panel zooms in on the region marked by the dashed lines in the top plot containing the Mg II h and k lines, which are proxies for chromospheric activity in the star. During a flare the intensities of the h and k lines also increase.