EUVST instrumental design and observation capability

The main scientific requirements for Solar-C_EUVST are those of high temporal and high spatial resolution with wide temperature coverage. In order to realize an instrument that meets these scientific requirements under size constraints given by the JAXA Epsilon vehicle, we examined the geometrical optical parameter space of possible solutions. As a result, we have identified the solution space that meets the EUVST science objectives and rocket envelope requirements. Among the solutions, we found an optics system that fulfills the requirement for 0.4” angular resolution over a field of view of 100”. This design achieves an effective collecting area 10 times larger than the Extreme-ultraviolet Imaging Spectrometer onboard the Hinode satellite, and will provide seamless observations of 4.2 – 7.2 log(K) plasmas for the first time. In the presentation, we discuss the trade-off studies performed toward the baseline of the optical system, and summarize the observation capability for EUVST such as spatial/spectral resolutions and wavelength coverage. In addition, we demonstrate expected solar UV spectra under some science cases.