Radiation in Science
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Diffuse radiation The observed diffuse UV radiation field is almost entirely due to starlight scattered by interstellar dust. With its wide field of view (0.9�) combined with the ability to reject stars because of its 2-dimensional imaging capability, TAUVEX will be able to trace the level of the astronomical diffuse radiation over the sky. There are other sources of radiation from the sky which have affected diffuse radiation measurements over the sky. The dark count rate from the instrument (the rate when no astronomical source is being observed) should be small and will be measured at intervals using a blocking filter. Terrestrial emission which often affects satellites in lower orbits will simply not be present at geostationary altitudes (except for the Lyman lines of hydrogen which will be blocked by the filters). Particularly in the near UV, zodiacal light - light from the Sun scattered by dust within our Solar System - will compete with the diffuse Galactic light and will have to be modelled and subtracted. Particularly important may be light from the Sun which is scattered into the field of view by the spacecraft or is internally scattered in the instrument. It will be an important part of the mission planning to ensure that this does not happen.
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Variability Because TAUVEX will continually scan over the sky, it is well suited for detecting variability on different time scales. We will build up depth in our fields by repeatedly passing over the same areas; depending on the sources to be observed we can choose our observation strategy such that we pass over specific objects at scientifically important intervals. Deep Surveys GALEX will observe a large fraction of the sky, or perhaps even the entire sky, as part of its sky survey and will go deeper in selected areas such as the Hubble Deep Field. We have chosen as our operational policy during the first 18 months to observe some fraction of the sky - perhaps 15% - to a depth much greater than GALEX. In addition, as our first science target, we will observe an area of the sky near one of the Celestial poles for a few days to obtain an extremely deep image of the sky.
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