Results are presented from a search for variations in solar granulation properties with heliographic latitudes. Photographs taken in the summers of 1985 and 1986 are used to study the power spectra in the direction perpendicular to the solar radius. It is found that there are no important differences in the power spectra obtained for positions

An analysis of the center to limb variation of the geometrical properties of spots has been carried out. It has revealed that spots do not have a symmetrical behaviour with respect to the centre of solar disk. Thus, the Wilson effect is not zero at δ = 0°, but at δ ≡ 45°W. Moreover, the inverse Wilson effect is the general rule in that interval

Several topics concerning the subsurface structure and evolution of sunspots are discussed. These include the morphology and stability of the magnetized plasma below a sunspot as well as the heat blockage in it. Current ideas on the origin and physical processes preceding the formation of an active region are reviewed.

Several topics concerning the subsurface structure and evolution of sunspots are discussed. These include the morphology and stability of the magnetized plasma below a sunspot as well as the heat blockage in it. In the second part of this paper, current ideas on the origin and physical processes preceding the formation of an active region are

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