  We analyze the long-term behavior of supergranule scale parameter, in active
and quiet regions (AR, QR), using the Kodaikanal digitized data archive. This
database provides century-long daily full disc observations of the Sun in Ca-II
K wavelength. In this paper, we study the distributions of the supergranular
scales, over the whole data duration, which show identical shape in these two
regimes. We found that the AR mean scale values are always higher than that of
the QR for every solar cycle. The mean scale values are highly correlated with
the sunspot number cycle amplitude and also with total solar irradiance (TSI)
variations. Such correlation establishes the cycle-wise mean scale as a
potential calibrator for the historical data reconstructions. We also see an
upward trend in the mean scales, as already been reported in TSI. This may
provide new input for climate forcing models. These results also give us
insight into the different evolutionary scenarios of the supergranules in the
presence of strong (AR) and weak (QR) magnetic fields.
