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The source of UV radiation in the solar system is mainly the Sun. The influence of its various compounds as well as the variability is discussed here. It is summarized on which time scales the solar UV radiation is variable and by which processes it influences the atmospheres of planets. UV radiation on solar like stars that may be surrounded by

Balloons, driven by hot air or some gas lighter than air, were the first artificial machines able to lift payloads (including humans) from the ground. After some pioneering flights the study of the physical properties of the terrestrial atmosphere constituted the first scientific target. A bit later astronomers realized that the turbulence of the

We describe the results of a search for diffuse sources in the 0.4 deg2 area of the XMM-Newton 770 ks survey of the Lockman Hole. An abundant population of sources is revealed, which is likely to stem from low-mass galaxy clusters at redshift near 1. We present the optical images in the K′ and R-bands for our candidates, suggesting a concentration

The main aim of JIS (Joint Information System) is to overcome the present lack of detailed knowledge amongst the European Solar Physics community. This lack of knowledge occurs at several levels: groups of researchers, institutions, scientific activities, running programs, resources, new opportunities, observational campaigns etc. JIS will not be

We present the first results obtained recently with Gemini GMOS MOS spectroscopy of Ly-alpha emitters at redshift z = 5.7 - 6.0. We are carry out a spectroscopic study using Gemini GMOS of our sample of 259 candidates to galaxies at redshifts up to 6.0. The sample comprises: (i) 17 Ly-alpha (LAE) candidates at redshift 5.7, (ii) 4 LAE candidates at