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Design and Performance of the ICON EUV Spectrograph

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Abstract

We present the design, implementation, and on-ground performance measurements of the Ionospheric Connection Explorer EUV spectrometer, ICON EUV, a wide field (\(17^{\circ}\times 12^{\circ}\)) extreme ultraviolet (EUV) imaging spectrograph designed to observe the lower ionosphere at tangent altitudes between 100 and 500 km. The primary targets of the spectrometer, which has a spectral range of 54–88 nm, are the Oii emission lines at 61.6 nm and 83.4 nm. Its design, using a single optical element, permits a 0 . 26 imaging resolution perpendicular to the spectral dispersion direction with a large (\(12^{\circ} \)) acceptance parallel to the dispersion direction while providing a slit-width dominated spectral resolution of \(R\sim25\) at 58.4 nm. Pre-flight calibration shows that the instrument has met all of the science performance requirements.

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Acknowledgements

We thank Carl Dobson for systems support, Steve Marker for keeping the vacuum facility operational, Christopher Scholz for technical support, Paul Turin and David Pankow who provided useful advice, and two anonymous referees who provided constructive critiques. ICON is supported by NASA’s Explorers Program through contracts NNG12FA45C and NNG12FA42I. This project utilizes data from the NIST Atomic Spectra Database. (NIST 2015) Special thanks to EUVester the pug who made boring meetings practically tolerable.

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Correspondence to Martin M. Sirk.

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The Ionospheric Connection Explorer (ICON) mission

Edited by Doug Rowland and Thomas J. Immel

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Sirk, M.M., Korpela, E.J., Ishikawa, Y. et al. Design and Performance of the ICON EUV Spectrograph. Space Sci Rev 212, 631–643 (2017). https://doi.org/10.1007/s11214-017-0384-2

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  • DOI: https://doi.org/10.1007/s11214-017-0384-2

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