[P-EM19] Frontiers in the solar physics

[PEM19-03] The Solar-C_EUVST Epsilon mission

*Toshifumi Shimizu¹ (1.Institute of Space and Astronautical Science, JAXA)

Keywords:Solar outer atmosphere, EUV Spectroscopy, New mission plan

Solar-C_EUVST (EUV High-Throughput Spectroscopic Telescope) is a solar physics mission which mission concept proposal has been selected as a candidate for JAXA competitive M-class missions in July 2018. As a fundamental step towards answering how the plasma universe is created and evolves, and how the Sun influences the Earth and other planets in our solar system, the proposed mission is designed to comprehensively understand how mass and energy are transferred throughout the solar atmosphere. The onboard science instrument EUVST is an EUV spectrometerwith slit-jaw imaging system that will simultaneously observe the solar atmosphere from the photosphere/chromosphere up to the corona with seamless temperature coverage, high spatial resolution, and high throughput for the first time. It is designed to provide an answer to the most fundamental questions in solar physics: how fundamental processes lead to the formation of the solar atmosphere and the solar wind, and how the solar atmosphere becomes unstable, releasing the energy that drives solar flares and eruptions. The mission will be launched and installed to a sun-synchronous polar orbit by a JAXA Epsilon vehicle in the first half of 2025. The paper will provide the overall description of the mission concept, science, and the latest status.