SOVAP-PICARD total solar irradiance : VI/152

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Authors : Meftah M. orcid , Chevalier A., Conscience C. (hide) , Chevalier A., Conscience C. et..al

VizieR DOI :
Bibcode : 2017yCat.6152....0M (ADS) (Simbad) (Objects)
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CDS Keywords : Sun; Spectroscopy
UAT : The Sun, Spectroscopy

Observation (OC)

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Inserted into VizieR : 23-Oct-2017
Last modification : 23-Oct-2017

Total solar irradiance as measured by the SOVAP radiometer onboard PICARD. (2016)

Keywords : Sun - Total Irradiance - Solar activity - Solar Cycle - Spacecraft

Abstract:From the SOlar VAriability PICARD (SOVAP) space-based radiometer, we obtained a new time series of the total solar irradiance (TSI) during Solar Cycle 24. Based on SOVAP data, we obtained that the TSI input at the top of the Earth's atmosphere at a distance of one astronomical unit from the Sun is 1361.8+/-2.4W/m^2^ (1{sigma}) representative of the 2008 solar minimum period. From 2010 to 2014, the amplitude of the changes has been of the order of +/-0.1%, corresponding to a range of about 2.7W/m^2^. To determine the TSI from SOVAP, we present here an improved instrument equation. A parameter was integrated from a theoretical analysis that highlighted the thermo-electrical non-equivalence of the radiometric cavity. From this approach, we ...(more)
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The Royal Meteorological Institute of Belgium (RMIB) has in its 33-year space history, since Spacelab in November 1983, launched six different TSI instruments of the DIfferential Absolute RADiometer (DIARAD) type on 11 space flights. The determination of the SOVAP TSI time series has required the establishment of modified instrument equations. For the nominal modes, a parameter ({Delta}Po) has been integrated from a theoretical analysis, which highlights the thermo-electrical non-equivalence of the radiometric cavity (open and closed). For the "Rad 10" mode, another parameter (KRad10) has been integrated from space calibration, which highlights the thermo-electrical non-equivalence between the right and the left cavity. TSI time series for different operation modes of SOVAP-DIARAD are displayed in Figure 3 using instrument equations. Thus, continuous time series of TSI observations have been constructed from the set of measurements made by the SOVAP radiometer from the different operation modes. The presented SOVAP composite includes all measurement modes normalised to the mean TSI of the "Auto 2" and "Auto 3" modes at the beginning of the PICARD mission.
Mustapha Meftah, MUSTAPHA.MEFTAH(at)latmos.ipsl.fr

                


                

                    

                


                

                    

                


                

                    
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