Analysis of full-disc Ca II K spectroheliograms - III. Plage area composite series covering 1892–2019

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Volume 639 (July 2020)

A&A, 639 (2020) A88

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Table 2.

Off-band Ca II K datasets analysed in this study.

Observatory	Acronym	Instrument	Central wavelength	Period	Images	SW
			[Å]			[Å]
Coimbra^(a)	CoW	SHG	3932.3	2008–2018	3113	0.16
Mauna Loa PSPT	MLW	Filter	3936.3	2004–2015	9552	1.0
Meudon	MDV	SHG	3933.4	2002–2017	5717	0.15
Meudon	MDR	SHG	3934.0	2002–2017	5652	0.15
Meudon^(a)	MDW	SHG	3932.3	2002–2018	4632	0.15

Notes. Columns are: name of the observatory, abbreviation used in this study, type of instrument, central wavelength, period of observations, number of images, and the spectral width of the spectrograph/filter.

^(a)

Here we restricted our analysis only to the CCD-based data centred at the wing of the line from the CoW and MDW series. Note, however, that off-band data from these sources extend back to 1925 and 1893, respectively.

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