The SoSWEET-SOUP (SOlar, Space Weather Extreme EvenTs and Stratospheric Ozone Ultimate Profiles) Constellation Mission

SoSWEET-SOUP is an innovative small satellites constellation which aims to measure on complementary platforms the solar influence on climate, namely on one part solar activity and spectral variability and, on the other, the different components of the Earth radiation budget, energy input and energy re-emitted at the top of the Earth atmosphere, with a particular focus on the UV part of the spectrum and on the ozone layer, which are most sensitive to solar variability. The far UV (FUV) is the only wavelength band with energy absorbed in the high atmosphere (stratosphere), in the ozone (Herzberg continuum, 200–220 nm) and oxygen bands, and its high variability is most probably at the origin of a climate influence. A simultaneous observation of the incoming FUV and of the ozone (O₃) production, would bring an invaluable information on this process of solar-climate forcing. Space instruments have already measured the different components of the Earth radiative budget but this is, to our knowledge, the first time that all instruments could be operated simultaneously on coordinated platforms. This characteristic guarantees by itself obtaining new significant original scientific results. Another major scientific and operational objective is Space Weather extreme events detection that is better expressed in Lyman Alpha with 3 orders more sensitivity than in H Alpha and a resolution and contrast of eruptions largely superior to the commonly used He II line at 30.4 nm. Prevision is also possible hours in advance by following the flux rope deformation and rising in the atmosphere.