Comparison of the imaging Hα excess with different solar activity indices during Solar Cycle 24 in 2012–2020. Top row: imaging Hα excess E₁₀₀ of bright features (left), imaging Hα deficit D₁₀₀ of dark features (middle), and mean intensity of Hα excess regions (right). Bottom row: Mg II index (left), F10.7 cm radio flux (middle), and relative sunspot number (right) for daily observations. The monthly average for all tracers is shown as a white line. The gray areas in the background indicate the northern and southern magnetic field reversals in November 2012 and March 2014, respectively.