Centennial Total Solar Irradiance Variation

Remote Sensing

Jan Cornelis¹  Mustapha Meftah²  Steven Dewitte³ 

[1] ETRO Department, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;LATMOS, CNRS, 78280 Guyancourt, France;Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium;

关键词: total solar irradiance;    sunspot number;   

DOI  :  10.3390/rs14051072

来源: DOAJ

【 摘 要 】

Total Solar Irradiance (TSI) quantifies the solar energy received by the Earth and therefore is of direct relevance for a possible solar influence on climate change on Earth. We analyse the TSI space measurements from 1991 to 2021, and we derive a regression model that reproduces the measured daily TSI variations with a Root Mean Square Error (RMSE) of 0.17 W/m². The daily TSI regression model uses the MgII core to wing ratio as a facular brightening proxy and the Photometric Sunspot Index (PSI) as a measure of sunspot darkening. We reconstruct the annual mean TSI backwards to 1700 based on the Sunspot Number (SN), calibrated on the space measurements with an RMSE of 0.086 W/m². The analysis of the 11 year running mean TSI reconstruction confirms the existence of a 105 year Gleissberg cycle. The TSI level of the current grand minimum is only about 0.15 W/m² higher than the TSI level of the grand minimum in the beginning of the 18th century.

【 授权许可】

Unknown