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

Harder, J. W.; Béland, S.; Penton, Steven V.; Woods, T. N.

doi:10.1007/s11207-022-02001-9

Cited by 8 publications

(5 citation statements)

References 29 publications

(50 reference statements)

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“…Finally, Rome/PSPT observations have also helped with the analysis of TSI and SSI measurements (e.g. Harder et al, 2019Harder et al, , 2022, and of the impact of solar spectral irradiance variability on Earth's atmosphere (e.g. Merkel et al, 2011;Ermolli et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, due to the high quality of Rome/PSPT Ca II K data, they also acted as the reference data set for the first plage area composite series, which extends back to 1892 (Chatzistergos et al, 2020a). Finally, Rome/PSPT observations have also helped with the analysis of TSI and SSI measurements (e.g., Harder et al, 2019Harder et al, , 2022, and of the impact of solar spectral irradiance variability on Earth's atmosphere (e.g., Merkel et al, 2011;Ermolli et al, 2013). In addition, Rome/PSPT observations have been used as contextual data in the analysis of the small-scale processes revealed by high-resolution observations of the solar atmosphere (e.g., Ermolli et al, 2022).…”

Section: Resultsmentioning

confidence: 99%

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Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23–25

Ermolli

Giorgi

Chatzistergos

2022

Front. Astron. Space Sci.

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The Rome Precision Solar Photometric Telescope (Rome/PSPT) is a ground-based telescope engaged in precision solar photometry. It has a 27-year database of full-disk images of the photosphere and chromosphere beginning in 1996 and continuing to 2022. The solar images have been obtained daily, weather permitting, with approximately 2 arcsec/pixel scale in Ca II K line at 393.3 nm, G-band at 430.6 nm, and continuum in the blue and red parts of the spectrum at 409.4 nm and 607.2 nm, respectively. Regular observations were also performed at the green continuum at 535.7 nm for a period of about 18 months. Since the first-light, Rome/PSPT operations have been directed at understanding the source of short-and long-term solar irradiance changes, spanning from 1 min to several months, and from 1 year to a few solar cycles, respectively. However, Rome/PSPT data have also served to study a variety of other topics, including the photometric properties of solar disk features and of the supergranulation manifested by the chromospheric network. Moreover, they have been unique in allowing to connect series of historical and modern full-disk solar observations, especially the Ca II K line data. Here, we provide an overview of the Rome/PSPT telescope and of the solar monitoring carried out with it from its first light to the present, across solar cycles 23–25. We also briefly describe the main results achieved with Rome/PSPT data, and give an overview of new results being derived with the whole time series of observations covering the period 1996–2022.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23–25

Ermolli

Giorgi

Chatzistergos

2022

Front. Astron. Space Sci.

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“…On shorter timescales, such as the 5 month period shown in Figure 2, the SSI shows similar variability to the TSI (Ball et al 2011). There is some community uncertainty about whether the long-term variability in the SORCE/SIM data, as shown in Figure 1, is real (i.e., solar) or instrumental (Ball et al 2016;Harder et al 2021).…”

Section: Spectral Solar-irradiance Measurementsmentioning

confidence: 93%

Correlations between Total and Spectral Solar Irradiance Variations

Kopp,

Nèmec,

Shapiro

2024

ApJ

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We compare short-term (seven solar rotations), wavelength-dependent temporal variations in spectral solar irradiance (SSI) with those from the total solar irradiance (TSI). Using space-based measurements, we empirically find good correlations across most of the visible and near-infrared (NIR) spectral range, suggesting that the TSI time variability can provide a useful estimate of SSI variability. These empirically determined correlations are consistent with physics-based bolometric variations, providing a straightforward wavelength-dependent parameterization of the SSI variability given a known change in the TSI. Using a solar-irradiance model to distinguish the facular and sunspot contributions, which are responsible for nearly all the irradiance variability on timescales longer than a day, we confirm these results and determine the correlation contributions due to each magnetic activity type individually. The correlations determined from the model agree in functional form to those of the empirical data, although we do note differences near opacity minimum (1.6 μm). Our results provide a simple TSI-based estimate of the time dependence of the spectral solar variability across the ultraviolet to NIR spectral regions, with the TSI accounting for 94% of the variability in the SSI over the 400–1200 nm range.

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“…Harder et al (2022a) provides detailed comparison of the SIM SSI observations from SORCE and TSIS-1, and they produced a new version of the SORCE SIM SSI data product that has the SORCE SIM irradiances re-normalized to be consistent with that from TSIS-1 SIM. The SORCE SIM SSI products were also improved with new corrections for SIM instrument trends (Harder et al, 2022b).…”

Section: Overview Of Sist-projectsmentioning

confidence: 99%

Overview of NASA's Solar Irradiance Science Team #2 (SIST-2) Program

Woods

Considine

2022

Preprint

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The Solar Irradiance Science Team #2 (SIST-2) program is a competitively solicited National Aeronautics and Space Administration (NASA) Earth Science Division (ESD) science research program providing three-year awards beginning in July 2018 to quantify and understand the solar irradiance variability and implications for Earth's climate and atmospheric composition. The purpose for the SIST-2 program is limited to the accurate specification of the incoming solar irradiance into the Earth system considering the 44-year satellite data record as well as proxies to which the satellite record can be tied. The SIST-2 program funded eight research grants to study the variability of the total solar irradiance (TSI) and solar spectral irradiance (SSI) and to develop improved space-based data sets, solar proxies, and variability models of the solar irradiance. The SIST-2 projects are briefly introduced.

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

Cited by 8 publications

References 29 publications

Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23–25

Rome Precision Solar Photometric Telescope: precision solar full-disk photometry during solar cycles 23–25

Correlations between Total and Spectral Solar Irradiance Variations

Overview of NASA's Solar Irradiance Science Team #2 (SIST-2) Program

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