Solar Radiation and Climate Experiment (SORCE) X-Ray Photometer System (XPS): Final Data-Processing Algorithms

Woods, T. N.; Elliott, J. P.

doi:10.1007/s11207-022-01997-4

Cited by 7 publications

(9 citation statements)

References 37 publications

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“…This model suggests that, during times of low to moderate solar activity, the warmer temperature component varies between about 5 and 6 MK, but during times of moderate to high solar activity this component can get higher than 10 MK. These higher temperatures (10 MK) have been shown in some DEM analyses such as Caspi et al (2015) and Woods & Elliott (2022) and are compared later in Section 9. However, this model is generated using MinXSS-1 data, which was only taken during times of low to moderate solar activity.…”

Section: Correlation To F107 Fluxmentioning

confidence: 56%

“…For comparison of the temperatures and emission measures found by this model to those of existing models, the XUV Photometer System (XPS) differential emission measure (DEM) models for both quiet Sun (QS) and active regions (AR) are used (Woods & Elliott 2022). These models report DEM curves of emission measure versus temperature for all solar plasma above about 1 MK to higher than 14 MK.…”

Section: Data Productsmentioning

confidence: 99%

“…Some DEM curves are made to model specific spectra such as in Caspi et al (2015) that show a model with temperatures in the range of 1.8-10.7 MK. Other DEM models, such as the XPS DEM are made to be representations of average contributions of QS and AR (Woods & Elliott 2022). Figure 7 shows the comparison between the SWM model with a F10.7 value ranging from 67 SFU to 100 SFU and the XPS DEM models for QS and AR.…”

Section: Comparison To Other Modelsmentioning

confidence: 99%

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Modeling the Daily Variations of the Coronal X-ray Spectral Irradiance with Two Temperatures and Two Emission Measures

Schwab

Woods

Mason

2023

ApJ

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The Miniature X-ray Solar Spectrometer (MinXSS-1) CubeSat observed solar X-rays between 0.5 and 10 keV. A two-temperature, two-emission-measure model is fit to each daily averaged spectrum. These daily average temperatures and emission measures are plotted against the corresponding daily solar 10.7 cm radio flux (F10.7) value and a linear correlation is found between each that we call the Schwab Woods Mason (SWM) model. The linear trends show that one can estimate the solar spectrum between 0.5 and 10 keV based on the F10.7 measurement alone. The cooler temperature component of this model represents the quiescent Sun contribution to the spectra and is essentially independent of solar activity, meaning the daily average quiescent Sun is accurately described by a single temperature (1.70 MK) regardless of solar intensity and only the emission measure corresponding to this temperature needs to be adjusted for higher or lower solar intensity. The warmer temperature component is shown to represent active region contributions to the spectra and varies between 5 and 6 MK. The Geostationary Operational Environmental Satellite (GOES) XRS-B data between 1 and 8 Å is used to validate this model and it is found that the ratio between the SWM model irradiance and the GOES XRS-B irradiance is close to unity on average. MinXSS-1 spectra during quiescent solar conditions have very low counts beyond around 3 keV. The SWM model can generate MinXSS-1 or Dual Aperture X-ray Solar Spectrometer spectra at very high spectral resolution and with extended energy ranges to fill in gaps between measurements and extend predictions back to 1947.

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Section: Correlation To F107 Fluxmentioning

confidence: 56%

Section: Data Productsmentioning

confidence: 99%

Section: Comparison To Other Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling the Daily Variations of the Coronal X-ray Spectral Irradiance with Two Temperatures and Two Emission Measures

Schwab

Woods

Mason

2023

ApJ

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“…The SORCE/XPS is a set of photometers with ≈ 10 nm bandpass filters covering the extreme ultraviolet (EUV: 10 -120 nm) and soft X-ray (SXR: 0.1 -10 nm) ranges. The XPS Level 4 spectral model in 1-nm bins for the 1 -27 nm range (Woods and Elliott, 2022) is used for this variability study instead of the XPS Level 3 broadband irradiance products. To fill the spectral gap in the SORCE SSI measurements between 27 nm and 115 nm, we use the solar EUV irradiance measurements from the Solar EUV Experiment (SEE) onboard NASA's Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) mission .…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

Self Cite

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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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“…With the reduced capability of the SORCE spacecraft to provide routine stellar calibrations for SOLSTICE in the later years, a special rocket experiment was flown in June 2018 to provide underflight validation for SOLSTICE; those results are presented by Thiemann et al (2023). Woods and Elliott (2022) provide the inflight calibration results used for the XPS Version 12 data products and also the improved reference spectra in the 0 -40 nm range for the XPS Level 4 (model) product.…”

mentioning

confidence: 99%

The Solar Radiation and Climate Experiment (SORCE) Mission: Final Calibrations and Data Products

Woods

Leibacher

2023

Sol Phys

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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 topical collection provides an overview of some of the key SORCE science results, an overview of mission operations and how anomalies impacted the science observations, a detailed description of the updated algorithms used in producing the final data products of TSI and SSI from the four SORCE instruments, and results from an underflight calibration-rocket experiment flown in June 2018. The 17-year-long SORCE mission has made many contributions to the climate records of TSI and SSI that date back to the 1970s, and, fortunately, similar observations from the Total and Spectral Solar Irradiance Sensor (TSIS-1) are able to continue these Sun-climate records after SORCE without a gap.

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Solar Radiation and Climate Experiment (SORCE) X-Ray Photometer System (XPS): Final Data-Processing Algorithms

Cited by 7 publications

References 37 publications

Modeling the Daily Variations of the Coronal X-ray Spectral Irradiance with Two Temperatures and Two Emission Measures

Modeling the Daily Variations of the Coronal X-ray Spectral Irradiance with Two Temperatures and Two Emission Measures

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

The Solar Radiation and Climate Experiment (SORCE) Mission: Final Calibrations and Data Products

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