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We study the connection between the chromospheric and photospheric behaviourof the active late-type star FK Comae. We use spot temperature modelling, lightcurve inversion based on narrow- and wide-band photometric measurements, Halphaobservations from 1997-2010, and Doppler maps from 2004-2010 to compare thebehaviour of chromospheric and photospheric features. Investigatinglow-resolution Halpha spectra we find that the changes in the chromosphere seemto happen mainly on a time scale longer than a few hours, but shortervariations were also observed. According to the Halpha measurements prominencesare often found in the chromosphere that reach to more than a stellar radiusand are stable for weeks, and which seem to be often, but not every timeconnected with dark photospheric spots. The rotational modulation of the Halphaemission seems to typically be anticorrelated with the light curve, but we didnot find convincing evidence of a clear connection in the long-term trends ofthe Halpha emission and the brightness of the star. In addition, FK Com seemsto be in an unusually quiet state in 2009-2010 with very little chromosphericactivity and low spot contrast, that might indicate the long-term decrease ofactivity.

Study of FK Comae Berenices: VII. Correlating photospheric and chromospheric activity