Revisiting the SATIRE-S irradiance reconstruction: Heritage of Mt Wilson magnetograms and Ca II K observations

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Table 2.

Characteristics of magnetogram archives used in this study.

Dataset	Platform	Type	Period	Noise level		Pixel scale	Sunspot source	N images	N days		Chained to
				Mean	σ	[″/pixel]			Total	Composite
KP/512	Ground-based	Magnetogram	1974–1993	8.0	1.2	1.0	FD continuum	1371	1371	1360	Meudon
Meudon	Ground-based	Ca II K	1974–2017	–		0.9–2.2 ^(a)	Mandal et al. (2020)	12262	9863	4124	SoHO/MDI
MW I	Ground-based	Magnetogram	1983–1988	2.0	0.3	3.8	Mandal et al. (2020)	8911	1476	352	Meudon
MW II	Ground-based	Magnetogram	1988–1995	2.0	0.3	3.8	Mandal et al. (2020)	18482	2049	398	Meudon
MW III	Ground-based	Magnetogram	1996–2013	2.0	0.3	5.7	Mandal et al. (2020)	45180	3344	50	SoHO/MDI
KP/SPM	Ground-based	Magnetogram	1992–2003	4.0	0.7	1.1	FD continuum	2055	2055	1145	Meudon
SFO	Ground-based	Ca II K	1992–2013	–		2.6	Mandal et al. (2020)	4004	3856	191	SoHO/MDI
SoHO/MDI	Space-based	Magnetogram	1999–2010	11.8	4.0	2.0	FD continuum	3941	3941	3745	SDO/HMI
Rome/PSPT	Ground-based	Ca II K	2000–2022	–		2.0	FD continuum	3206	3206	133	SoHO/MDI
SDO/HMI	Space-based	Magnetogram	2010-	6.4	0.9	0.5	FD continuum	5429	5429	5429	–

Notes. The columns are: name of dataset, ground- or space-based, direct or reconstructed (from Ca II K) magnetograms, the period covered by the data (as used in this study), mean and standard deviation of noise level, pixel scale, source of the sunspot information (that is from the (quasi-)simultaneous full-disc, FD, continuum data or from the Mandal et al. 2020 database), the total number of images, the number of days that we analysed, the number of days that entered the SATIRE-S composite, and the bridging dataset that was used to cross-calibrate the filling factors to the SDO/HMI level.

^(a)

The CCD-based data since 2002 have a pixel scale of 1.5″, while the photographic data derive from two digitisations with pixel scales of 0.9″ and 2.2″.

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