Dependence of the photospheric vertical flow characteristics on the granule dimension

The first high spectral resolution and white-light images obtained at the T HEMIS telescope with the Italian Panoramic Monochromator (IPM), are analyze d to study intensity and velocity fluctuations in the photosphere of the su n. Monochromatic images, in two spectral ranges around 538.03 nm (C I line) and 557.61 nm (Fe I line), are used to characterize the vertical structure of the photosphere. Granulation cells and granules are obtained by segment ation of white-light images using suitable finding algorithms. We observe the height dependence of velocity vs. intensity fluctuations, an d we found a dependence of velocity and intensity on granule dimension. Our results show that granules increase their intensity with dimension in the lower solar photosphere. In the higher photosphere, on the contrary, the in tensity decreases with the dimension.