Table 1.
Properties of synoptic map data sets used in this study.
| Data set | Spectral line | Time span | Carrington rotations | Map resolution |
|---|---|---|---|---|
| WSO | Fe 525 nm | 1976.3– | 1641– | 72⋅30 |
| MWO | Fe 525 nm | 1974.5–2013.0 | 1617–2131 | 971⋅512 |
| Kitt Peak | Fe 868.8 nm | 1992.8–2003.7 | 1863–2006 | 360⋅180 |
| SOLIS/VSM | Fe 630.2 nm | 2003.7–2017.8( * *) | 2006–2196 | 360⋅180( * ) |
| MDI | Ni 676.8 nm | 1996.4–2011.1 | 1909–2104 | 3600⋅1080 |
| HMI | Ni 617.3 nm | 2010.4– | 2096 – | 3600⋅1440 |
Notes. Map resolution stands for the number of pixels in longitude and latitude. The grid is linear in latitude in the MWO data set and linear in sine latitude in other data sets. ( * )SOLIS/VSM maps are also available in higher 1800*900 pixel resolution. ( * *)SOLIS observations were interrupted because of relocation in 2017 (still unfinished when this paper was submitted).
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