Instrument Calibration of the Interface Region Imaging Spectrograph (IRIS) Mission
J. P. Wulser, Sarah Jaeggli, B. De Pontieu, T. Tarbell, P. Boerner, S. Freeland, W. Liu, R. Timmons, Sean Brannon, Charles Kankelborg, C. Madsen, S. McKillop, J. Prchlik, S. Saar, N. Schanche, P. Bryans, M. Wiesmann
The Interface Region Imaging Spectrograph (IRIS) is a NASA small explorer mission that provides high-resolution spectra and images of the Sun in the 133-141nm and 278-283nm wavelength bands. The IRIS data are archived in calibrated form and made available to the public within seven days of observing. The calibrations applied to the data include dark correction, scattered light and background correction, flat fielding, geometric distortion correction, and wavelength calibration. In addition, the IRIS team has calibrated the IRIS absolute throughput as a function of wavelength and has been tracking throughput changes over the course of the mission. As a resource for the IRIS data user, this article describes the details of these calibrations as they have evolved over the first few years of the mission. References to online documentation provide access to additional information and future updates.
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