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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.

Observations and theory both point out that the magnetic photosphere is not smooth but irregular at optically-thin scales. The relevance of these irregularities for a proper magnetic field diagnostics depends upon the not yet known structure of the magnetic field fluctuations (and, of course, on the purpose of our determination). Sánchez Almeida &

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