SOL–ACES: Auto-calibrating EUV/UV spectrometers for measurements onboard the International Space Station

Schmidtke, G.; Brunner, Raimund; Eberhard, D.; Halford, B.; Klocke, U.; Knothe, M.; Konz, W.; Riedel, Wolfgang; Wolf, H.

doi:10.1016/j.asr.2005.01.112

Cited by 24 publications

(13 citation statements)

References 6 publications

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“…21 (Schmidtke, 1976b). Replacing the monochromator by narrow bandpass filters the in-flight calibration is repeatedly applied on demand as accomplished with the instrument Solar Auto-Calibrating EUV/UV Spectrometers (SolACES) aboard the payload SOLAR at 12 G. Schmidtke: Extreme ultraviolet spectral irradiance measurements the Columbus Module of the International Space Station (Schmidtke et al, 2006a(Schmidtke et al, , 2014 as shown in Figs. 22a-d.…”

Section: Euv-ssi Data Derived After the Year 2000mentioning

confidence: 99%

“…The filter wheel with 48 apertures selects narrow intervals of the solar EUV spectrum for ionization chamber measurements. The gas reservoirs are structural elements of the instrument simultaneously (Schmidtke et al, 2006a; copyright permission granted by Elsevier publishing). With this pool of instrumentation two aspects of data accumulation are realized.…”

Section: Euv-ssi Data Derived After the Year 2000mentioning

confidence: 99%

“…-SOLAR/SolACES (Schmidtke et al, 2006a(Schmidtke et al, , 2014: since the launch of the payload SOLAR on 8 February 2008 with the SolACES, it measures SSI EUV data in the spectral range from 16 to 150 nm. The mission is extended to February 2017.…”

Section: Euv-ssi Data Derived After the Year 2000mentioning

confidence: 99%

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Extreme ultraviolet spectral irradiance measurements since 1946

Schmidtke

2015

Hist. Geo Space. Sci.

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Abstract. In the physics of the upper atmosphere the solar extreme ultraviolet (EUV) radiation plays a dominant role controlling most of the thermospheric/ionospheric (T/I) processes. Since this part of the solar spectrum is absorbed in the thermosphere, platforms to measure the EUV fluxes became only available with the development of rockets reaching altitude levels exceeding 80 km. With the availability of V2 rockets used in space research, recording of EUV spectra started in 1946 using photographic films. The development of pointing devices to accurately orient the spectrographs toward the sun initiated intense activities in solar-terrestrial research. The application of photoelectric recording technology enabled the scientists placing EUV spectrometers aboard satellites observing qualitatively strong variability of the solar EUV irradiance on short-, medium-, and longterm scales. However, as more measurements were performed more radiometric EUV data diverged due to the inherent degradation of the EUV instruments with time. Also, continuous recording of the EUV energy input to the T/I system was not achieved. It is only at the end of the last century that there was progress made in solving the serious problem of degradation enabling to monitore solar EUV fluxes with sufficient radiometric accuracy. The data sets available allow composing the data available to the first set of EUV data covering a period of 11 years for the first time. Based on the sophisticated instrumentation verified in space, future EUV measurements of the solar spectral irradiance (SSI) are promising accuracy levels of about 5 % and less. With added low-cost equipment, real-time measurements will allow providing data needed in ionospheric modeling, e.g., for correcting propagation delays of navigation signals from space to earth. Adding EUV airglow and auroral emission monitoring by airglow cameras, the impact of space weather on the terrestrial T/I system can be studied with a spectral terrestrial irradiance camera (STI-Cam) and also be used investigating real-time space weather effects and deriving more detailed correction procedures for the evaluation of Global Navigation Satellite System (GNSS) signals. Progress in physics goes with achieving higher accuracy in measurements. This review historically guides the reader on the ways of exploring the impact of the variable solar radiation in the extreme ultraviolet spectral region on our upper atmosphere in the altitude regime from 80 to 1000 km.

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Section: Euv-ssi Data Derived After the Year 2000mentioning

confidence: 99%

Section: Euv-ssi Data Derived After the Year 2000mentioning

confidence: 99%

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Extreme ultraviolet spectral irradiance measurements since 1946

Schmidtke

2015

Hist. Geo Space. Sci.

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“…Two complementary instruments were integrated into the SOLAR payload, the Solar Auto Calibrating EUV/UV Sunphotometer (SolACES) and the SOlar Variable and Irradiance Monitor (SOVIM). SolACES measures the solar Extreme UltraViolet (EUV) irradiance from 16 nm to 150 nm (Schmidtke et al 2006). Radiometric calibration is maintained using current ionization chambers as primary detector standards.…”

Section: Introductionmentioning

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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“…They obtained an agreement within the uncertainty range with observations from the Solar EUV Experiment (SEE; Woods et al 2005) onboard the NASA Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) mission. More recently, Thuillier et al (2014) carried out a reconstruction of solar irradiance in various spectral bands over the solar spectrum, including the EUV as observed with the SolACES instrument (Schmidtke et al 2006a) onboard the ISS/SOLAR platform (Schmidtke et al 2006b). For the EUV reconstruction the authors employ the SOLMOD code (Haberreiter 2011) along with the segmentation of SDO/AIA images and find a reasonable agreement with the SolACES irradiance measurements.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of the solar EUV irradiance from 1996 to 2010 based on SOHO/EIT images

Haberreiter

Delouille

Mampaey

et al. 2014

J. Space Weather Space Clim.

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The solar Extreme UltraViolet (EUV) spectrum has important effects on the Earth's upper atmosphere. For a detailed investigation of these effects it is important to have a consistent data series of the EUV spectral irradiance available. We present a reconstruction of the solar EUV irradiance based on SOHO/EIT images, along with synthetic spectra calculated using different coronal features which represent the brightness variation of the solar atmosphere. The EIT images are segmented with the SPoCA2 tool which separates the features based on a fixed brightness classification scheme. With the SOLMOD code we then calculate intensity spectra for the 10-100 nm wavelength range and each of the coronal features. Weighting the intensity spectra with the area covered by each of the features yields the temporal variation of the EUV spectrum. The reconstructed spectrum is then validated against the spectral irradiance as observed with SOHO/SEM. Our approach leads to good agreement between the reconstructed and the observed spectral irradiance. This study is an important step toward understanding variations in the solar EUV spectrum and ultimately its effect on the Earth's upper atmosphere.

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SOL–ACES: Auto-calibrating EUV/UV spectrometers for measurements onboard the International Space Station

Cited by 24 publications

References 6 publications

Extreme ultraviolet spectral irradiance measurements since 1946

Extreme ultraviolet spectral irradiance measurements since 1946

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

Reconstruction of the solar EUV irradiance from 1996 to 2010 based on SOHO/EIT images

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