Caption: 
Simulations of what the CubIXSS imaging spectrometer will see during one minute of a solar flare (top) and over one hour from an active region. At the top of the detector, four images of the Sun are taken through different filters that block different X-ray wavelengths (“colors”). At the bottom of the detector, the entire X-ray spectrum from each point on the Sun spreads out sideways, allowing a detailed measurement of the temperature and composition of plasma at each point in the corona. (The solar images are rotated so the solar north pole points to the right.)