Accurate, absolute, and reproducible measurements are the expected qualities of any instrument. A differential image motion monitor (DIMM) is presented which assesses astronomical seeing with those requirements. It has been designed (with collaboration of the staff of the Department d'Astrophysique de l'Universite de Nice and the Instituto de

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The process of emergence of magnetic flux from the depths of the convection zone to the surface is presented in the framework of self-consistent model for the storage of field in the lower overshoot regions and as the mechanism responsible for some of the regularities observed in active regions. We have performed numerical simulations of the

We present maps of the sky at intermediate angular resolution (5 deg) of the declination range 35.0-45.0 deg obtained with the Tenerife cosmic microwave background (CMB) experiments using data up until 1992. The data were taken with bean-switching radiometers operating at 10.4 and 14.9 GHz. Right ascension scans were made at 2.5 deg declination

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