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An on Orbit Determination of Point Spread Functions for the Interface Region Imaging Spectrograph.

Hans Courrier1, Charles Kankelborg1, Bart De Pontieu2

  • 11Solar Group, Dept. of Physics, Montana State Univ. Bozeman, P.O. Box 173840, Bozeman, MT 59717-3840 USA.

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|November 6, 2018
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Summary

Scientists characterized on-orbit spatial point spread functions (PSFs) for NASA

Keywords:
Instrumentation: high angular resolutionSpace vehicles: instrumentsSun: atmosphere

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Area of Science:

  • Solar Physics
  • Instrument Characterization
  • Spectroscopy

Background:

  • The Interface Region Imaging Spectrograph (IRIS) provides crucial data for solar physics.
  • Accurate characterization of instrument Point Spread Functions (PSFs) is essential for deconvolution and image restoration.

Purpose of the Study:

  • To determine the on-orbit spatial Point Spread Functions (PSFs) for the Near- (NUV) and Far- (FUV) Ultra-Violet spectrograph channels of the IRIS.
  • To assess the performance of these PSFs in improving spectral data quality.

Main Methods:

  • Utilized the 2016 Mercury transit of the Sun for on-orbit calibration.
  • Employed a semi-blind Richardson-Lucy deconvolution method to estimate PSFs for NUV and FUV channels.
  • Calculated Modulation Transfer Functions (MTFs) to quantify spectral resolution.

Main Results:

  • Achieved a resolution of 2.47 cycles/arcsec (NUV, 2796 Å) and 2.55 cycles/arcsec (NUV, 2814 Å).
  • Demonstrated pixel-limited resolution of 3.0 cycles/arcsec in the FUV channels.
  • Successfully reduced instrument artifacts in Mercury transit spectra using estimated PSFs.

Conclusions:

  • The estimated PSFs effectively improve the quality of IRIS spectral data.
  • The developed PSF estimation and deconvolution routines are valuable tools for solar physics research.
  • Demonstrated utility in analyzing explosive solar events through a case study.