WHY IS THE SOLAR CONSTANT NOT A CONSTANT?

被引：41

作者：

Li, K. J. ^{[1
,2
]}

Feng, W. ^{[3
]}

Xu, J. C. ^{[1
,4
]}

Gao, P. X. ^{[1
]}

Yang, L. H. ^{[1
,4
]}

Liang, H. F. ^{[5
]}

Zhan, L. S. ^{[6
]}

机构：

[1] CAS, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China

[2] CAS, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China

[3] Kunming Univ Sci & Technol, Res Ctr Anal & Measurement, Kunming 650093, Peoples R China

[4] CAS, Grad Sch, Beijing 100863, Peoples R China

[5] Yunnan Normal Univ, Dept Phys, Kunming 650093, Peoples R China

[6] Jingdezhen Ceram Inst, Jingdezhen 333001, Jiangxi, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 747卷 / 02期

关键词：

Sun: activity; Sun: general; sunspots; IRRADIANCE; CYCLE; PERIODICITIES; LUMINOSITY; EVOLUTION;

D O I：

10.1088/0004-637X/747/2/135

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In order to probe the mechanism of variations of the solar constant on the inter-solar-cycle scale, the total solar irradiance (TSI; the so-called solar constant) in the time interval of 1978 November 7 to 2010 September 20 is decomposed into three components through empirical mode decomposition and time-frequency analyses. The first component is the rotation signal, counting up to 42.31% of the total variation of TSI, which is understood to be mainly caused by large magnetic structures, including sunspot groups. The second is an annual-variation signal, counting up to 15.17% of the total variation, the origin of which is not known at this point in time. Finally, the third is the inter-solar-cycle signal, counting up to 42.52%, which is inferred to be caused by the network magnetic elements in quiet regions, whose magnetic flux ranges from (4.27-38.01) x 10(19) Mx.

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