5328 20260109085321.0 SCART-2021-0077 Harra, Louise A Spectral Solar Irradiance Monitor (SoSpIM) on the JAXA Solar-C Space Mission 2021 As a fundamental step towards answer- ing how the plasma universe is creat- ed and evolves, and how the Sun influ- ences the Earth and other planets in our solar system, the JAXA Solar-C mission (Shimizu et al., 2020) is designed to com- prehensively understand how mass and energy are transferred throughout the solar atmosphere. The EUV High-Throughput Spectroscopic Telescope (EUVST) onboard does this by observing all the temperature regimes of the atmosphere from the chromosphere to the corona sim- ultaneously. As well as the EUVST, there will be a Solar Spectral Irradiance Moni- tor (SoSpIM). STCE Alberti, Andrea Berghmans, David Dominique, Marie Gissot, Samuel Hara, Hirohisa Imada, Shinsuke Koller, Silvio Krucker, Säm Pfiffner, Daniel Rozanov, Eugene Shimizu, Toshifumi Sukhodolov, Timofei Tye, Daniel Watanabe, Kyoko SCOSTEP/PRESTO NEWSLETTER 27 2021 1-2 david.berghmans@observatoire.be published in NONREF