Contribution of the Solar Constant (SOLCON) program to the long‐term total solar irradiance observations

Dewitte, Steven; Joukoff, A.; Crommelynck, D.; Lee, R. B.; Helizon, R.; Wilson, Robert S.

doi:10.1029/2000ja900160

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…The simulations show that a servo gain of K p = 1000 allows the system to reach an equilibrium after 90 s. In addition, the shuttered operation allows us to avoid the thermal offset problem. To minimize temperature variations of the shutter, special care will be taken to avoid that it heats up in hot orbits and cools down in cold orbits [40]. If the shutter temperature changes while it is closed, re-radiation into the cavity produces a false time-varying signal, inducing large measurement errors.…”

Section: Discussionmentioning

confidence: 99%

Design and Analysis of a Next-Generation Wide Field-of-View Earth Radiation Budget Radiometer

et al. 2020

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Climate on Earth is determined by the Earth Radiation Budget (ERB), which quantifies the incoming and outgoing radiative energy fluxes. The ERB can be monitored by non-scanning wide field-of-view radiometers, or by scanning narrow field-of-view radiometers. We propose an enhanced design for the wide field-of-view radiometer, with as key features the use of a near-spherical cavity to obtain a uniform angular sensitivity and the integration of the shuttered electrical substitution principle, eliminating long term drifts of the radiometer and improving its time response. The target absolute accuracy is 1 W/m 2 and the target stability is 0.1 W/m 2 per decade for the measurement of the total outgoing Earth’s radiation. In order to increase the spatial resolution and to separate the total outgoing radiation into reflected Solar and emitted thermal radiation, we propose the joint use of the radiometer with wide field-of-view Shortwave (400–900 nm) and Longwave (8–14 μm) cameras. This paper presents the concept and design of the novel wide field-of-view radiometer, including simulations and analyses of its expected performance. We focus on mechanical design and the measurement characteristics based on optical and thermal analyses. In combination with the cameras, we obtain an estimated accuracy of 0.44 W/m 2 .

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Section: Discussionmentioning

confidence: 99%

Design and Analysis of a Next-Generation Wide Field-of-View Earth Radiation Budget Radiometer

et al. 2020

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“…The currently available long-term TSI measurements are summarised in Table I. Since the measurement periods for individual instruments are limited -see column 1 of Table I -the TSI measurements of different instruments have to be composited to construct a long-term TSI time-series. Different TSI composites have been proposed in Crommelynck and Dewitte (1997), Fröhlich and Lean (2002) and Willson and Mordvinov (2003). The obtained composite TSI time series in these three studies show some substantial differences, e.g.…”

Section: Introductionmentioning

confidence: 95%

“…. ERBS Lee et al, 19951991-2001ACRIM 2 UARS Willson, 19941992SOLCON Space shuttle Crommelynck et al, 1994Dewitte et al, 20011992-1993SOVA 1 EURECA Crommelynck et al, 19941992-1993SOVA 2 EURECA Romero, Wehrli, and Fröhlich, 19941996 DIARAD/VIRGO SOHO Dewitte et al, 20041996 et al, 2000;Kopp, Lawrence, and Rottman, 2003 -in which the TSI time series measured by the different instruments are adjusted relative to each other as well as possible, (2) quantify the uncertainty of the obtained composite TSI time series in an objective empirical way, (3) quantify the long-term quiet sun irradiance trend.…”

Section: Introductionmentioning

confidence: 97%

Measurement and Uncertainty of the Long-Term Total Solar Irradiance Trend

et al. 2004

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A possible long-term trend of the total solar irradiance could be a natural cause for climate variations on Earth. Measurement of the total solar irradiance with space radiometers started in 1978. We present a new total solar irradiance composite, with an uncertainty of ± 0.35 W m −2 . From the minimum in 1995 to the maximum in 2002 the total solar irradiance increased by 1.6 W m −2 . In between the minima of 1987 and 1995 the total solar irradiance increased by 0.15 W m −2 .

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“…Recent studies have shown that the accuracy of the latter is about 1 W/m 2 (Crommelynck et al, 1995), (Dewitte et al, 2001), thus being also the accuracy of the incoming solar flux product. Validation of the thermal emitted flux and the reflected solar flux was carried out over different surface types.…”

Section: Validationmentioning

confidence: 99%

Operational climate monitoring from space: the EUMETSAT Satellite Application Facility on Climate Monitoring (CM-SAF)

et al. 2009

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Abstract. The Satellite Application Facility on Climate Monitoring (CM-SAF) aims at the provision of satellite-derived geophysical parameter data sets suitable for climate monitoring. CM-SAF provides climatologies for Essential Climate Variables (ECV), as required by the Global Climate Observing System implementation plan in support of the UNFCCC. Several cloud parameters, surface albedo, radiation fluxes at the top of the atmosphere and at the surface as well as atmospheric temperature and humidity products form a sound basis for climate monitoring of the atmosphere. The products are categorized in monitoring data sets obtained in near real time and data sets based on carefully intercalibrated radiances. The CM-SAF products are derived from several instruments on-board operational satellites in geostationary and polar orbit as the Meteosat and NOAA satellites, respectively. The existing data sets will be continued using data from the instruments on-board the new joint NOAA/EUMETSAT Meteorological Operational Polar satellite. The products have mostly been validated against several ground-based data sets both in situ and remotely sensed. The accomplished accuracy for products derived in near real time is sufficient to monitor variability on diurnal and seasonal scales. The demands on accuracy increase the longer the considered time scale is. Thus, interannual variability or trends can only be assessed if the sensor data are corrected for jumps created by instrument changes on successive satellites and more subtle effects like instrument and orbit drift and also changes to the spectral response function of an instrument. Thus, a central goal of the recently started Continuous Development and Operations Phase of the CM-SAF (2007–2012) is to further improve all CM-SAF data products to a quality level that allows for studies of interannual variability.

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Contribution of the Solar Constant (SOLCON) program to the long‐term total solar irradiance observations

Cited by 8 publications

References 7 publications

Design and Analysis of a Next-Generation Wide Field-of-View Earth Radiation Budget Radiometer

Design and Analysis of a Next-Generation Wide Field-of-View Earth Radiation Budget Radiometer

Measurement and Uncertainty of the Long-Term Total Solar Irradiance Trend

Operational climate monitoring from space: the EUMETSAT Satellite Application Facility on Climate Monitoring (CM-SAF)

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