An on Orbit Determination of Point Spread Functions for the Interface Region Imaging Spectrograph |
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Authors: | Hans Courrier Charles Kankelborg Bart De Pontieu Jean-Pierre Wülser |
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Affiliation: | 1.Solar Group, Dept. of Physics,Montana State Univ. Bozeman,Bozeman,USA;2.Lockheed Martin Solar & Astrophysics Laboratory,Lockheed Martin Advanced Technology Center,Palo Alto,USA |
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Abstract: | Using the 2016 Mercury transit of the Sun, we characterize on orbit spatial point spread functions (PSFs) for the Near- (NUV) and Far- (FUV) Ultra-Violet spectrograph channels of NASA’s Interface Region Imaging Spectrograph (IRIS). A semi-blind Richardson–Lucy deconvolution method is used to estimate PSFs for each channel. Corresponding estimates of Modulation Transfer Functions (MTFs) indicate resolution of 2.47 cycles/arcsec in the NUV channel near 2796 Å and 2.55 cycles/arcsec near 2814 Å. In the short (({approx},1336~mathring{mathrm{A}})) and long (({approx},1394~mathring{mathrm{A}})) wavelength FUV channels, our MTFs show pixel-limited resolution (3.0 cycles/arcsec). The PSF estimates perform well under deconvolution, removing or significantly reducing instrument artifacts in the Mercury transit spectra. The usefulness of the PSFs is demonstrated in a case study of an isolated explosive event. PSF estimates and deconvolution routines are provided through a SolarSoft module. |
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