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NASA's Interface Region Imaging Spectrograph (IRIS) provides calibrated ultraviolet images and spectra of the Sun. Images capture features as small as 240 km every 5-10 seconds at temperatures from 5,000 K to 120,000 K (up to 10 million K during flares). Spectra are obtained every 2-30 seconds along a slit, providing data on material velocity, temperature, and density in the solar atmosphere.
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