X-ray flux in 1–20 Å versus stellar age for solar analogs. The six stars studied by Ribas et al. (2005), including the Sun, are shown as open circles and the corresponding power law fit as a solid line. ι Hor is displayed with a filled circle. Vertical lines in ι Hor and the Sun account for their activity cycle as measured in the ASCA 0.5–10 keV band (Orlando et al. 2001). All fluxes have been normalized to a distance of 1 AU from the star and a stellar radius of 1 R⊙.
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