Degradation Correction of TSIS SIM

Mauceri, Steffen; Richard, E. C.; Pilewskie, P.; Harber, D.; Coddington, O.; Béland, S.; Chambliss, Michael; Carson, Steve

doi:10.1007/s11207-020-01707-y

Cited by 7 publications

(10 citation statements)

References 29 publications

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“…There is a need to account for both exposure time and clock time to track the ever-changing rate of prism-transmission degradation. The next generation of the SIM spectral radiometer, TSIS-1/SIM now deployed on the International Space Station , started observations on 14 March 2018 with several instrument-design enhancements based on lessons learned from SORCE/SIM that will provide more effective degradations corrections (Richard et al., 2020 ; Mauceri et al., 2020 ; Harder et al., 2022 ). Foremost among the SORCE/SIM lessons learned for the TSIS-1/SIM are: An ultrahigh vacuum-compatible optical cavity that completely excludes polymerics; Strict, non-varying rates of exposure; Improved detector-noise characteristics; The addition of a third spectrometer channel to account for degradation in the monthly calibration channel.…”

Section: Discussionmentioning

confidence: 99%

“…Some initial comparisons between SORCE/SIM and TSIS-1/SIM are provided by Mauceri et al. ( 2020 ). Furthermore, Richard et al.…”

Section: Introductionmentioning

confidence: 99%

“…( 2020 ) and Mauceri et al. ( 2020 ) provide pre-flight and in-flight instrument characterizations and calibrations for TSIS-1/SIM, which can be compared to similar techniques for SORCE/SIM.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Trend Analysis in the Solar Radiation and Climate Experiment (SORCE)/Spectral Irradiance Monitor (SIM)

et al. 2022

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The Solar Radiation and Climate Experiment/Spectral Irradiance Monitor (SORCE/SIM) instrument was launched on 25 January 2003 with mission termination occurring on 25 February 2020. The SORCE/SIM provides a unique data set of the variability in solar spectral irradiance (SSI) during the descending phase of Solar Cycle 23 (SC23) from April 2003 to February 2009, the weaker solar-maximum conditions of SC24, and the quiescent SC24/SC25 minimum. The determination of the magnitude and phase of SSI variations rely on the unambiguous determination of the effects of the space environment and solar-exposure-related degradation mechanisms. The instrument-only corrections for SIM are based on a comparison of two functionally identical (mirror image) prism spectrometers with four independent detectors in each spectrometer channel. The degradation correction is strictly instrumental in its methodology and makes no assumptions about the magnitude, slope, or wavelength dependence of the SSI variability.

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Section: Discussionmentioning

confidence: 99%

“…Some initial comparisons between SORCE/SIM and TSIS-1/SIM are provided by Mauceri et al. ( 2020 ). Furthermore, Richard et al.…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Trend Analysis in the Solar Radiation and Climate Experiment (SORCE)/Spectral Irradiance Monitor (SIM)

et al. 2022

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“…All these methods involve some modelling and therefore come with assumptions. For example, Mauceri et al (2020) consider piecewise linear fits to compare instrument channels that have different duty cycles. The main challenge is to include the uncertainty that stems from these assumptions in the correction.…”

Section: Trend Detection In the Ssimentioning

confidence: 99%

“…A common strategy consists of duty cycling between identical sensors that are not exposed to the Sun for the same amount of time. Corrections can then be applied by assuming the degradation to be proportional to accumulated exposure time or to the fluence, and also to mission time (Kopp et al, 2005;Harder et al, 2009;Mauceri et al, 2020). A second approach consists in performing in-flight calibration to track instrument degradation, either by using stable stars (e.g.…”

Section: Introductionmentioning

confidence: 99%

Detecting undocumented trends in solar irradiance observations

Wit

2022

J. Space Weather Space Clim.

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Quantifying the long-term stability of solar irradiance observations is crucial for determining how the Sun varies in time and for detecting decadal climate change signals. The stability of irradiance observations is challenged by the degradation of instrumental sensitivity in space and by the corrections that are needed to mitigate this degradation. We propose a new framework for detecting instrumental trends, based on the existing idea of comparing the solar irradiance at pairs of dates for which a proxy quantity reaches the same level. Using a parametric model we then reconstruct the trend and its confidence interval at all times. While this method cannot formally prove the instrumental origin of the trends, the \modif{observation} of similar trends with different proxies provides strong evidence for a non-solar origin. We illustrate the method with spectral irradiance observations from the Solar Radiation and Climate Experiment (SORCE) mission, using various solar proxies such as sunspot number, MgII index, F10.7 index. The results support the existence of non-solar trends that exceed the level of solar cycle variability. After correcting the spectral irradiance for these trends, we find the difference between the levels observed at solar maximum and at solar minimum to be in better agreement with irradiance models.

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Solar-Cycle Variability Results from the Solar Radiation and Climate Experiment (SORCE) Mission

et al. 2022

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The Solar Radiation and Climate Experiment (SORCE) was a NASA mission that operated from 2003 to 2020 to provide key climate-monitoring measurements of total solar irradiance (TSI) and solar spectral irradiance (SSI). This 17-year mission made TSI and SSI observations during the declining phase of Solar Cycle 23, during all of Solar Cycle 24, and at the very beginning of Solar Cycle 25. The SORCE solar-variability results include comparisons of the solar irradiance observed during Solar Cycles 23 and 24 and the solar-cycle minima levels in 2008 – 2009 and 2019 – 2020. The differences between these two minima are very small and are not significantly above the estimate of instrument stability over the 11-year period. There are differences in the SSI variability for Solar Cycles 23 and 24, notably for wavelengths longer than 250 nm. Consistency comparisons with SORCE variability on solar-rotation timescales and solar-irradiance model predictions suggest that the SORCE Solar Cycle 24 SSI results might be more accurate than the SORCE Solar Cycle 23 results. The SORCE solar-variability results have been useful for many Sun–climate studies and will continue to serve as a reference for comparisons with future missions studying solar variability.

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Degradation Correction of TSIS SIM

Cited by 7 publications

References 29 publications

Long-Term Trend Analysis in the Solar Radiation and Climate Experiment (SORCE)/Spectral Irradiance Monitor (SIM)

Long-Term Trend Analysis in the Solar Radiation and Climate Experiment (SORCE)/Spectral Irradiance Monitor (SIM)

Detecting undocumented trends in solar irradiance observations

Solar-Cycle Variability Results from the Solar Radiation and Climate Experiment (SORCE) Mission

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