Multispectral Full-disk Solar Extreme Ultraviolet Imager

Solar Extreme Ultraviolet (EUV) has violent variation during solar eruption. Solar EUV imagers are important data for solar activities evolution analyses. Solar EUV spectral information can be applied in high temperature coronal plasma research. But both the traditional solar EUV telescope and the slit spectrograph have their limitations. High spectral resolution and wide field-ofview cannot be simultaneously achieved by either the traditional EUV imager or the spectrometer. The design of a new type of solar EUV multispectral imager is introduced in this paper. The full-disk solar image with high spectral and spatial resolution can be obtained by a kind of slitless grating with a grazing incidence structure. The field-of-view of the imager can be as broad as 47'. The high spectral resolution is 2×10^-3 nm per pixel and the spatial resolution is 1.4' per pixel. The temporal resolution of the full-disk is better than 60 s. The analysis of the full-disk spectral image and system response shows that the imager can observe the evolution of global solar activities, and can provide more comprehensive data for solar physics research and space weather forecast.