Photometric magnetic activity level, ⟨ S_{ph,k = 5} ⟩, as a function of the rotation period, P_rot, for the 310 solar-like pulsating stars observed by Kepler for which the rotation period was successfully measured (grey). Stars have been divided into hot (red), dwarf (blue), and subgiants (green) as defined in Fig. 3. The vertical black dotted lines mark the limit of P_rot = 5 days. The position of the Sun, ⟨ S_{ph,k = 5} ⟩ = 166.1 ± 2.6 ppm and P_rot = 25.4 days is indicated. The top and bottom dashed horizontal lines represent the corresponding solar magnetic activity level at maximum and minimum of the 11 year solar cycle. The solar values are colour−coded as in Fig. 4.