We report the variations of the UV spectrum of BP Tau from 5 to 19 January, 1992 when the star was monitored with IUE during 2 rotation periods. Our data indicate that lines that can be excited by recombination processes, such as those from O I and He II have periodic-like light curves, whereas lines that are only collisionally excited do not

Results of a ground-based CMB anisotropy experiment conducted at the Teide Observatory (Tenerife) are presented. The instrument is a four channel (3.1, 2.1, 1.3 and 1.1 mm) bolometer system coupled to a telescope consisting of a chopping off-axis parabolic primary mirror and an off-axis hyperbolic secondary. The resultant configuration is sensitive

Not Available

Not Available

Not Available

We have performed numerical simulations of the rise of magnetic flux tubes through the convection zone. We find that the observed proper motions of pores and sunspots in young active regions can be understood as a consequence of the Coriolis force: conservation of angular momentum leads to a retardation of the rising flux loop with respect to those