On-Orbit Sensitivity Evolution of the EUV Imaging Spectrometer on Hinode

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 Angstrom and Si VII 275.35 Angstrom 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 >10^6.1 K in the quiet-Sun data exhibit solar-cycle effects.

Solar Physics in press, 12 pages, 6 figures

References in corpus (1)

• Long-term Variation of the Corona in Quiet Regions

Cited by in corpus (6)

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• Are Chromospheric Nanoflares a Primary Source of Coronal Plasma?
• Inferring the Coronal Density Irregularity from EUV Spectra
• Plasma Diagnostics From Active Region and Quiet Sun Spectra Observed by Hinode/EIS: Quantifying the Departures from a Maxwellian Distribution