This paper addresses the problem of scattering line polarization and the Hanle effect in one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) media for the case of a two-level model atom without lower-level polarization and assuming complete frequency redistribution. The theoretical framework chosen for its formulation is the QED

A comparative study of the statistical properties of granulation in active and quiet regions is performed. The analysis is based on a high-resolution time series of simultaneous white light (lambda5425 Å) and G-band (lambda 4308 Å) images obtained at the Swedish Vacuum Solar Telescope, La Palma, Canary Islands. The G-band images have been used to

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The authors review the multifrequency behaviour of the so-called non-magnetic cataclysmic variables (NMCVs) after having discussed the classification of the CVs following different known approaches. They remark some open questions and give some new inputs for a faster and more general development of the studies of such binary systems in which the

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The preliminary results of a classical spectroscopic analysis of a facular region at mu=0.78 of ~100 arcsec x 50 arcsec are presented. The variation with magnetic activity of several spectroscopic parameters has been studied, showing clear evidence that granulation properties are modified.