The authors present preliminary results of the study of short-term variability of the BL Lac object OJ 287. There is evidence that the variability amplitude of OJ287 is greater when it is brighter.

Results from UV, optical and near-IR simultaneous observations for 11 BL Lac objects are reported. The authors find that for all but one source the spectral flux distribution can be described by a single power law (fν ∝ ν-α) plus, where relevant, the contribution of the host galaxy. The comparison of the optical-near-IR and UV spectral indices for

Not Available

The light curves of OJ 287 at UBVRIJHK, 22 and 37 GHz are presented for the 1993/94 observing campaign. Despite the considerable optical and infrared activity the light curve at 22 and 37 GHz is quite inactive. A slow increase in the flux is evident at both radio frequencies from the end of 1993, but this is much smaller than the visible

Not Available

Recent developments in the theory of the rise of magnetic flux from the bottom of the convection zone to the surface to produce active regions are reviewed. These include the explanation for the observed tilt angle of the main magnetic axis of the active region as well as for some of the asymmetries between the preceding and follower polarities. It