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Table 2.
Abbreviations used for Ca II K plage datasets.
| Dataset | Acronym | Period | Reference |
|---|---|---|---|
| Individual series | |||
| Arcetri | Ar | 1931–1974 | Ermolli et al. (2009a), |
| Big Bear | BB | 1982–2006 | Naqvi et al. (2010) |
| Coimbra | Co | 1925–2019 | Lourenço et al. (2019) |
| Kharkiv | Kh | 1952–2019 | Belkina et al. (1996) |
| Kodaikanal | Ko | 1904–2007 | Priyal et al. (2017) |
| Mauna Loa (a) | ML | 1998–2015 | Rast et al. (2008) |
| McMath-Hulbert | MM | 1948–1979 | Mohler & Dodson (1968) |
| Mees | MS | 1982–1998 | |
| Meudon | MD | 1893–2019 | Malherbe & Dalmasse (2019) |
| Mt Wilson | MW | 1915–1985 | Lefebvre et al. (2005) |
| Rome (b) | RP | 1996–2019 | Ermolli et al. (2007) |
| Sacramento Peak | SP | 1960–2002 | Tlatov et al. (2009) |
| San Fernando CFDT1 (c) | SF1 | 1988–2015 | Chapman et al. (1997) |
| San Fernando CFDT2 (d) | SF2 | 1992–2013 | Chapman et al. (1997) |
| Upice | UP | 1998–2019 | Klimeš et al. (1999) |
| Composite series | |||
| Solar Geophysical Data series | SGD | 1942–1987 | |
| Plage area composite | CEA20 | 1892–2019 | Chatzistergos et al. (2020c) |
Notes. The Ca II K plage area series are separated into those resulting from individual archives and composite series.
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