J. Space Weather Space Clim.
Volume 6, 2016
Brightness Variations of the Sun and Sun-like Stars and Resulting Influences on their Environments
|Number of page(s)||8|
|Published online||05 September 2016|
Total solar irradiance as measured by the SOVAP radiometer onboard PICARD
University of Paris-Saclay, University of Paris VI, CNRS, LATMOS, 11 Boulevard d’Alembert, 78280
2 Royal Meteorological Institute of Belgium, 3 Avenue Circulaire, 1180 Uccle, Belgique
* Corresponding author: Mustapha.Meftah@latmos.ipsl.fr
Accepted: 15 August 2016
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 ± 2.4 W m−2 (1σ) 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 2.7 W 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 obtained values that are lower than those previously provided with the same type of instrument. The results in this paper supersede the previous SOVAP analysis and provide the best SOVAP-based TSI-value estimate and its temporal variation.
Key words: Sun / Total Irradiance / Solar activity / Solar Cycle / Spacecraft
© M. Meftah et al., Published by EDP Sciences 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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