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Table 1
Summary description of the daily full-disc continuum intensity images and longitudinal magnetograms selected for this study.
| Proportion of | ||||||
| Instrument | No. of data days | Period [year.month.day] | period covered | Image size [pixel] | Pixel scale [arcsec] | Spectral line |
|
|
||||||
| KP512 | 1371 | 1974.08.23 to 1993.04.04 | 0.20 | 2048 × 2048 | 1 | Fe I 8688 Å |
| KPSPM | 2055 | 1992.11.21 to 2003.09.21 | 0.52 | 1788 × 1788 | 1.14 | Fe I 8688 Å |
| MDI | 3941 | 1999.02.02 to 2010.12.24 | 0.91 | 1024 × 1024 | 1.98 | Ni I 6768 Å |
| HMI | 1128 | 2010.04.30 to 2013.05.31 | 1.00 | 4096 × 4096 | 0.504 | Fe I 6173 Å |
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