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A reevaluation of the solar constant based on a 42-year total solar irradiance time series and a reconciliation of spaceborne observations
Solar Energy ( IF 6.7 ) Pub Date : 2018-04-06
Christian A. Gueymard

A reevaluation of the solar constant is undertaken here to take into account the progress in space radiometry that has occurred since the early 2000s. Various sources of spaceborne total solar irradiance (TSI) observations are investigated here, including the long-term ACRIM and PMOD composites, as well as recent observations from the SORCE-TIM, TCTE-TIM, and PICARD-PREMOS instruments. A proxy model is constructed using daily data of sunspot number, radio flux at 10.7 cm, and MgII index, as predictors for TSI over the 42-year period 1976–2017. These daily estimates are used to fill in 9.7% of missing TSI observations during that period. By comparison with these proxy estimates, the PMOD composite appears generally more reliable than the ACRIM composite before 2003, and particularly before 1981. The 42-year time span is separated into nine periods, each defining the revised TSI daily values from one or more sources that are selected based on the trend of their resemblance with the proxy model. A final correction is added to emulate the highly accurate absolute calibration of PREMOS. Based on the resulting TSI reconstruction, a revised solar constant value of 1361.1 W/m2 is obtained, with a standard uncertainty of 0.5 W/m2. The revised solar constant is ≈5 W/m2 less than the previous values promulgated in ASTM and ISO standards. A revision of these standards is thus highly recommended.



中文翻译:

根据42年的总太阳辐照时间序列和对星载观测值的调和,对太阳常数进行重新评估

考虑到自2000年代初以来发生的空间辐射测量技术的进展,此处对太阳常数进行了重新评估。本文研究了各种空间星载总太阳辐照度(TSI)观测资料,包括长期的ACRIM和PMOD复合材料,以及来自SORCE-TIM,TCTE-TIM和PICARD-PREMOS仪器的最新观测资料。使用太阳黑子数,10.7厘米处的无线电通量和MgII指数的每日数据构建代理模型,作为1976-2017年这42年期间TSI的预测指标。这些每日估算值用于填充该期间丢失的TSI观测值的9.7%。通过与这些代理估算值进行比较,2003年之前(尤其是1981年之前),PMOD组合通常看起来比ACRIM组合更可靠。42年的时间跨度分为九个时期,每个定义从一个或多个来源(根据与代理模型相似的趋势选择)选择的TSI每日修订值。添加了最终校正以模拟PREMOS的高精度绝对校准。根据生成的TSI重建,修正后的太阳常数值为1361.1 W / m2获得,用0.5 W的标准不确定度/米2。修订后的太阳常数比ASTM和ISO标准中发布的先前值低≈5W / m 2。因此,强烈建议修订这些标准。

更新日期:2018-04-06
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