  Finding solar-analog stars with fundamental properties as close as possible
to the Sun and studying the characteristics of their surface magnetic activity
is a very promising way to understand the solar variability and its associated
dynamo process. However, the identification of solar-analog stars depends on
the accuracy of the estimated stellar parameters. Thanks to the photometric
CoROT and Kepler space missions, the addition of asteroseismic data was proven
to provide the most accurate fundamental properties that can be derived from
stellar modeling today. Here, we present our latest results on the
solar-stellar connection by studying 18 solar analogs that we identified among
the Kepler seismic sample (Salabert et al., 2016a). We measured their magnetic
activity properties using the observations collected by the Kepler satellite
and the ground-based, high-resolution HERMES spectrograph. The photospheric
(Sph) and chromospheric (S) magnetic activity proxies of these seismic solar
analogs are compared in relation to the solar activity. We show that the
activity of the Sun is comparable to the activity of the seismic solar analogs,
within the maximum-to-minimum temporal variations of the 11-year solar activity
cycle. Furthermore, we report on the discovery of temporal variability in the
acoustic frequencies of the young (1 Gyr-old) solar analog KIC10644253 with a
modulation of about 1.5 years, which agrees with the derived photospheric
activity Sph (Salabert et al, 2016b). It could be the signature of the
short-period modulation, or quasi-biennal oscillation, of its magnetic activity
as observed in the Sun and in the 1-Gyr-old solar analog HD30495. In addition,
the lithium abundance and the chromospheric activity estimated from HERMES
confirms that KIC10644253 is a young and more active star than the Sun.
