The use of self-consistent calibrations to recover absorption bands in the black-body spectrum

Sperfeld, Peter; Yousef, S Galal; Metzdorf, J.; Nawo, B.; ller, W M

doi:10.1088/0026-1394/37/5/6

Cited by 14 publications

(14 citation statements)

References 7 publications

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“…The instrument was calibrated at PhysikalischTechnische Bundesanstalt (PTB, Braunschweig in Germany) before launch in 2008. The pre-flight absolute calibration of each SOLAR/SOLSPEC channel was carried out with the BB 3200pg blackbody of PTB (Sapritsky et al 1997;Sperfeld et al 1998Sperfeld et al , 2000Sperfeld et al , 2013. In-flight, regular acquisition with lamps system were performed to track the effects of instrument aging.…”

Section: Solar/solspec Design and Backgroundmentioning

confidence: 99%

SOLAR-ISS: A new reference spectrum based on SOLAR/SOLSPEC observations

Meftah

Damé

Bolsée

et al. 2018

A&A

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Context. Since April 5, 2008 and up to February 15, 2017, the SOLar SPECtrometer (SOLSPEC) instrument of the SOLAR payload on board the International Space Station (ISS) has performed accurate measurements of solar spectral irradiance (SSI) from the middle ultraviolet to the infrared (165 to 3088 nm). These measurements are of primary importance for a better understanding of solar physics and the impact of solar variability on climate. In particular, a new reference solar spectrum (SOLAR-ISS) is established in April 2008 during the solar minima of cycles 23-24 thanks to revised engineering corrections, improved calibrations, and advanced procedures to account for thermal and aging corrections of the SOLAR/SOLSPEC instrument. Aims. The main objective of this article is to present a new high-resolution solar spectrum with a mean absolute uncertainty of 1.26% at 1σ from 165 to 3000 nm. This solar spectrum is based on solar observations of the SOLAR/SOLSPEC space-based instrument. Methods. The SOLAR/SOLSPEC instrument consists of three separate double monochromators that use concave holographic gratings to cover the middle ultraviolet (UV), visible (VIS), and infrared (IR) domains. Our best ultraviolet, visible, and infrared spectra are merged into a single absolute solar spectrum covering the 165-3000 nm domain. The resulting solar spectrum has a spectral resolution varying between 0.6 and 9.5 nm in the 165-3000 nm wavelength range. We build a new solar reference spectrum (SOLAR-ISS) by constraining existing high-resolution spectra to SOLAR/SOLSPEC observed spectrum. For that purpose, we account for the difference of resolution between the two spectra using the SOLAR/SOLSPEC instrumental slit functions. Results. Using SOLAR/SOLSPEC data, a new solar spectrum covering the 165-3000 nm wavelength range is built and is representative of the 2008 solar minimum. It has a resolution better than 0.1 nm below 1000 nm and 1 nm in the 1000-3000 nm wavelength range. The new solar spectrum (SOLAR-ISS) highlights significant differences with previous solar reference spectra and with solar spectra based on models. The integral of the SOLAR-ISS solar spectrum yields a total solar irradiance of 1372.3 ± 16.9 Wm −2 at 1σ, that is yet 11 Wm −2 over the value recommended by the International Astronomical Union in 2015.

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Section: Solar/solspec Design and Backgroundmentioning

confidence: 99%

SOLAR-ISS: A new reference spectrum based on SOLAR/SOLSPEC observations

Meftah

Damé

Bolsée

et al. 2018

A&A

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“…The blackbody source BB3200pg at the PTB was used in June 2007 for the absolute calibration of SOLAR/SOLSPEC above 200 nm. The blackbody is a primary standard for the realization and dissemination of spectral irradiance; it is described in detail in Sperfeld et al (1998), Sperfeld et al (2000), Sperfeld et al (2010) and Sapritsky et al (1997) and summarized in Bolsée et al (2014) for SO-LAR/SOLSPEC applications. The blackbody provides a very stable reference source of known spectral radiance using Planck's law.…”

Section: Absolute Radiometric Calibrationmentioning

confidence: 99%

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

Bolsée

Pereira

Gillotay

et al. 2017

A&A

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Context. The SOLar SPECtrum (SOLSPEC) experiment is part of the Solar Monitoring Observatory (SOLAR) payload, and has been externally mounted on the Columbus module of the International Space Station (ISS) since 2008. SOLAR/SOLSPEC combines three absolutely calibrated double monochromators with concave gratings for measuring the solar spectral irradiance (SSI) from 166 nm to 3088 nm. This physical quantity is a key input for studies of climatology, planetary atmospheres, and solar physics. Aims. A general description of the instrument is given, including in-flight operations and performance of the ultraviolet (UV) channel from 175 nm to 340 nm. Methods. We developed a range of processing and correction methods, which are described in detail. For example, methods for correcting thermal behavior effects, instrument linearity, and especially the accuracy of the wavelength and absolute radiometric scales have been validated by modeling the standard uncertainties. Results. The deliverable is a quiet Sun UV reference solar spectrum as measured by SOLAR/SOLSPEC during the minimum of solar activity prior to cycle 24. Comparisons with other instruments measuring SSI are also presented.

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“…For this investigation we have assumed a value of 0.9995, with an estimated uncertainty of 0.0005. The cavity temperatures used in these measurements are lower than those that have been found to cause absorptionband effects above approximately 3100 K [33][34][35].…”

Section: High Temperature Blackbodymentioning

confidence: 99%

Wideband filter radiometers for blackbody temperature measurements

Boivin¹,

Bamber²,

Gaertner³

et al. 2010

Journal of Modern Optics

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The use of high-temperature blackbody (HTBB) radiators to realize primary spectral irradiance scales requires that the operating temperature of the HTBB be accurately determined. We have developed five filter radiometers (FRs) to measure the temperature of the National Research Council of Canada's HTBB. The FRs are designed to minimize sensitivity to ambient temperature fluctuations. They incorporate air-spaced colored glass filters and a Si photodiode detector that are housed in a cell whose temperature is controlled to AE0.1 C by means of annular thermoelectric elements at the front and rear of the cell. These wideband filter radiometers operate in four different wavelength bands. The spectral responsivity measurements were performed in an underfill geometry for a power-mode calibration that is traceable to NRC's cryogenic radiometer. The spectral temperature sensitivity of each of these FRs has been measured. The apertures for these FRs were cold-formed by swaging machine-cut apertures onto precision dowel pins. A description of the filter radiometer design, fabrication and testing, together with a detailed uncertainty analysis, is presented. We derive the equations that relate the spectral irradiance measured by the FRs to the spectral radiance and temperature of the HTBB, and deal specifically with the change of index of refraction over the path of the radiation from the interior of the HTBB to the FRs. We believe these equations are more accurate than recently published derivations. Our measurements of the operating temperature of our HTBB working at temperatures near 2500 K, 2700 K and 2900 K, together with measurements using a pyrometer, show agreement between the five filter radiometers and with the pyrometer to within the estimated uncertainties.

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The use of self-consistent calibrations to recover absorption bands in the black-body spectrum

Cited by 14 publications

References 7 publications

SOLAR-ISS: A new reference spectrum based on SOLAR/SOLSPEC observations

SOLAR-ISS: A new reference spectrum based on SOLAR/SOLSPEC observations

SOLAR/SOLSPEC mission on ISS: In-flight performance for SSI measurements in the UV

Wideband filter radiometers for blackbody temperature measurements

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