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Table 1
Properties of synoptic map data sets used in this study.
| Data set | Spectral line | Time span | Carrington rotations | Map resolution | |||||||
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| 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 | Fe 630.2 nm | 2003.7– | 2006– | 1800*900 | |||||||
| 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. Grid is linear in latitude in the MWO data set and linear in sine latitude in other data sets.
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