[P-EM10] Frontiers in solar physics

[PEM10-10] Solar-C(EUVST)/SoSpIM development status and scientific studies

*Kyoko Watanabe¹, Louise Harra², Shinsuke Imada³, Tomoko Kawate⁴, Hirohisa Hara⁵, Toshifumi Shimizu⁶, Yoshizumi Miyoshi³, Nozomu Nishitani³, Tomoaki Hori³, Akimasa Ieda³, Toshiki Kawai³, Hidekatsu Jin⁷, Chihiro Tao⁷, Shohei Nishimoto¹ (1.National Defense Academy of Japan, 2.Physical Meteorological Observatory in Davos, World Radiation Center, 3.Institute for Space-Earth Environmental Research, Nagoya University, 4.National Institute for Fusion Science, National Institutes of Natural Sciences, 5.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 6.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 7.National Institute of Information and Communications Technology)

Keywords:Solar-C(EUVST), Irradiance Monitor, Space Weather

The Solar Spectral Irradiance Monitor (SoSpIM) has been developed by the Physical Meteorological Observatory in Davos World Radiation Center (PMOD/WRC) in Switzerland to be installed on the Solar-C(EUVST), the next solar observation satellite.

SoSpIM has two observation wavelength bands (170-215Å, 1115-1275Å) that are also covered by Solar-C(EUVST). By having a redundant system with three independent channels for each wavelength band, the instrument can monitor the degradation and contamination of Solar-C(EUVST). SoSpIM is expected to be used for calibration of the Solar-C(EUVST).

The extreme ultraviolet (EUV) emissions observed by SoSpIM play a main role in controlling the composition of the Earth's upper atmosphere. Both wavelength bands are mainly absorbed in the thermosphere and ionosphere, which are usually formed at altitudes > 80 km, and are thought to change the composition of the Earth's atmosphere around this altitude. In particular, it is known that sudden fluctuations in EUV emissions due to solar flares greatly change the composition and height profile of the ionosphere, causing space weather phenomena such as communication failures. Therefore, we set up the SoSpIM science team to study not only solar flare physics, but also discuss what kind of space weather research is feasible using SoSpIM data.

In this presentation, we will report on the current development status of SoSpIM and the scientific topics considered to be contributed by SoSpIM data.