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The variation of a stellar light curve owing to the rotational modulation bythe magnetic features (starspots and faculae) on the star's surface can be usedto investigate the magnetic properties of the host star. In this paper, we usethe periodicity and magnitude of the light-curve variation, as two proxies,suggested by (He et al. 2015), to study the stellar magnetic properties for alarge sample of G-type main sequence \emph{Kepler} targets, for which therotation periods recently determined by (McQuillan et al. 2014). By analyzingthe correlation between the two magnetic proxies, it is found that: (1) The twoproxies are positively correlated for most of the stars in our sample, and thepercentages of negative, zero, and positive correlation are $4.27\%$, $6.81\%$,and $88.91\%$, respectively; (2) Negative correlation stars cannot have largemagnitude of light-curve variation; (3) with the increase of rotation period,the relative number of positive correlation stars decreases and the negativecorrelation one increases. These results indicate that the stars with shorterrotation period tend to have positive correlation between the two proxies, anda good portion of the positive correlation stars have larger magnitude oflight-curve variation (and hence more intense magnetic activities) than thenegative correlation stars.

Magnetic activity analysis for a sample of G-type main sequence \emph{Kepler} targets