Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...404..637m&link_type=abstract
Astronomy and Astrophysics, v.404, p.637-643 (2003)
Astronomy and Astrophysics
Astrophysics
16
Sun: Corona, Stars: Coronae, X-Rays: Stars
Scientific paper
We analyze the time variations of the solar X-ray luminosity observed with Yohkoh/SXT with the aim to compare the X-ray variability of the Sun with that of the other solar-like main sequence stars as function of the relevant time scales. Since the observational set-up and strategies used to observe the Sun differ from those used for the other stars, we have explored the solar X-ray variability properties starting from the available solar data, trying to reproduce the observational procedures adopted for the stars. We have quantified how the solar variability amplitude increases with the explored time scales and found that solar-cycle variability can contribute at most up to 60% to the spread observed in nearby solar-like star X-ray luminosity distribution functions. The comparison between the Sun and the nearby stars is consistent with a scenario in which a fraction of moderately active stars (/line{L}_x < 1028 erg/s) have X-ray variability similar to the Sun, while more active stars lack solar-like cyclic coronal activity.
Marino Alma Angela
Micela Giuseppina
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