Context. The largest dataset of stellar activity measurements available at present is the one obtained at the Mount Wilson Observatory, where high-precision H+K fluxes have been measured from 1966 for about 2200 stars. Since the h and k lines at λ2800 Å are formed in a similar way to the H+K emission lines, they are also good indicators of chromospheric structure. The International Ultraviolet Explorer (IUE) provides a large database of UV spectra in the band 1150-3350 Å from 1978 to 1995, which can also be used to study stellar activity.
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