We present a consistent model of storage, instability and dynamical eruption of magnetic flux tubes in the solar convection zone and underlying overshoot region. Using a convection zone model with self-consistent overshoot layer, we calculate equilibrium configurations of magnetic flux tubes and determine their linear stability properties, taking

IAUC 5923 available at Central Bureau for Astronomical Telegrams. IAUC 5923 available at Central Bureau for Astronomical Telegrams.

IAUC 5921 available at Central Bureau for Astronomical Telegrams. IAUC 5921 available at Central Bureau for Astronomical Telegrams.

The aims, achievements and plans of the Working Group on `Radioastronomical Databases' of IAU Commission 40 are outlined. Special recommendations emerged from its present first meeting. These regard the electronic availability of published tabular data, the educational needs to prepare for the age of `Network Astronomy', the preparation of a master

The Infrared Space Observatory (ISO) photometer is one of four instruments on-board the European Space Agency ISO scheduled for launch in September 1995. It covers the wavelength range 2.5 to 240 micrometers with wide and narrow spectral bands. Diffraction- limited observations as well as wide-beam measurements of faint extended sources are

Temperature fluctuations in the cosmic microwave background are a key prediction of cosmological models of structure formation in the early Universe. Ground-based multi-frequency radio observations of the microwave background reveal well defined features that are not of atmospheric or Galactic origin; instead, they delineate the primordial density