On a difference of the chromospheric background intensity between the equatorial and polar regions of the sun

Small chromospheric emission centres (here defined as flocculi) were studied photometrically on K_{2, 3, 2} spectroheliograms taken at the Arcetri Observatory. The intensity ratio between I_fl, the flocculus brightness, and I_chr, the brightness of the chromospheric background, was determined. A difference was found between the polar and the equatorial limb values of the ratio I_fl/I_chr.