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On June 1, 1990 the German X-ray observatory ROSAT started its mission to open a new era in X-ray astronomy. Doubtless, this is the most ambitious project realized up to now in the short history of this young astronomical discipline. Equipped with the largest imaging X-ray telescope ever inserted into an earth orbit ROSAT has provided a tremendous amount of new scientific data and insights.
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ChroTel is a telescope to observe the solar chromosphere across the full disk. ChroTel observes the Sun pseudo-simultaneously in three channels at Ca II K, H-alpha and Helium 1083.