Abstract
Since its launch on 22 September 2006, the EUV Imaging Spectrometer onboard the Hinode satellite has exhibited a gradual decay in sensitivity. Using spectroheliograms taken in the Fe viii 185.21 Å and Si vii 275.35 Å emission lines in quiet regions near Sun center we characterize that decay. For the period from December 2006 to March 2012, the decline in the sensitivity can be characterized as an exponential decay with an average time constant of 7358±1030 days (20.2±2.8 years). Emission lines formed at temperatures ≳ 106.1 K in the quiet Sun data exhibit solar-cycle effects.
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Acknowledgements
Hinode is a Japanese mission developed, launched, and operated by ISAS/JAXA in partnership with NAOJ, NASA, and STFC (UK). Additional operational support is provided by ESA and NSC (Norway). CHIANTI is a collaborative project involving the NRL (USA), the Universities of Florence (Italy) and Cambridge (UK), and George Mason University (USA). The author acknowledges support from the NASA Hinode program.
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Mariska, J.T. On-Orbit Sensitivity Evolution of the EUV Imaging Spectrometer on Hinode . Sol Phys 282, 629–639 (2013). https://doi.org/10.1007/s11207-012-0200-9
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DOI: https://doi.org/10.1007/s11207-012-0200-9