The future X-ray Sun

Magnetic activity is ubiquitous among solarlike stars and coronal Xrayemission is perhaps the most powerful diagnostic. Stellar Xray emission decaysduring the first Gyr by several orders of magnitude. However, it is currentlyunknown if and how this decay continues for older stars, because observationalconstraints are sparse due to the Xray faintness of these systems. We proposeto remedy this situation by obtaining Xray data of old solar analogs, i.e.,stars that have essentially the same stellar properties as the Sun so that wesample only age effects on stellar activity. Our sample of 13 old solar analogswill clarify the Xray future of the Sun. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]