Reconstruction of total solar irradiance 1974–2009

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Volume 541 (May 2012)

A&A, 541 (2012) A27

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Table 2

Detailed comparison between PMOD and SATIRE-S considering only dates when both datasets overlap¹.

Cycle maximum² and minimum TSI, W m^-2

Series	Min C20/21³	Max C21	Min C21/22	Max C22	Min C22/23	Max C23	Min C23/24

SATIRE-S_Ind	1361.06	1362.01	1361.08	1361.96	1361.01	1361.74	1360.82
PMOD	–	1362.02	1361.14	1362.10	1361.07	1361.82	1360.82

Cycle maximum and minimum TSI relative to 2008 minimum, W m^-2

Series	Min C20/21	Max C21	Min C21/22	Max C22	Min C22/23	Max C23	Min C23/24

SATIRE-S_Ind	0.24	1.19	0.26	1.14	0.20	0.92	0.00
PMOD	–	1.21	0.32 ± 0.01	1.28	0.25 ± 0.10	1.00	0.00 ± 0.16

Statistics of full and cycle periods

Period	Start date	End date		Slope	No. points

Full	1978/12/10	2009/10/31	0.958 [0.919]	0.995	5899
Cycle 23	1996/05/15	2008/12/15	0.981 [0.963]	0.978	3760
Cycle 22	1986/09/15	1996/05/14	0.917 [0.840]	1.040	1148
Cycle 21 (part)	1978/12/09	1986/09/14	0.898 [0.806]	1.050	740

Notes.

⁽¹⁾

The uppermost table shows the absolute values at activity cycle maximum and minimum. The middle table gives irradiance values relative to the December 2008 minimum with uncertainty estimates from SATIRE-S_Ind and errors from PMOD. The bottom set give the regression slopes and correlation coefficients from the different cycles of the reconstruction.

⁽²⁾

TSI values are calculated from ± 90 days centred on the dates of maximum and minimum smoothed monthly sunspot number from SIDC data.

⁽³⁾

Only SATIRE-S_Ind data exist around the minimum of cycle 20/21 minimum. Minimum values are estimated between June 1975 and July 1976 due to the lack of data around the sunspot minimum of June 1976.

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