Table 1.
Previously published results on the relation between magnetic flux and Ca II intensity along with our results.
| Ref. | Line | Bandwidth | N | Period | Type | Location | Region size | Pixel scale | Relation |
|---|---|---|---|---|---|---|---|---|---|
| (Å) | (″) | ||||||||
| 1 | K | 1.1 | 7 | 21–27/10/1968 | AR | Disc | 2.4″ × 2.4″, 1″ × 1″ | 2.4, 1 | Polynomial |
| 2 | K | 1.1 | 1 | 09/1968 | QS | Centre | 2.4″ × 2.4″ | 2.4 | Linear |
| 3 | K | 3.2 | 1 | 15/10/1987 | AR | Centre | 256″ × 360″ | 4 | Binning (a) |
| 4 | K | 0.1 | 1 | 22/10/1985 | AR | Centre | 390″ × 540″ | 2.4 | Power law |
| 5 | K | 0.1 | 1 | 21/12/1994 | AR | Centre | 60° ×40° | 4 | Power law |
| 6 | K | 0.3 | 2 | 13/10/1996, 13/04/1997 | QS | Centre | ∼170″ × 160″ | 2 | Linear |
| 7 | K | 0.5 | 8 | 16/01/1992–08/07/1993 | QS+AR | Full-disc | 2 | Power law | |
| 7 | K | 3 | 7 | 16/01/1992–08/07/1993 | QS+AR | Full-disc | 4 | Power law | |
| 7 | K | 10 | 4 | 03/06/1993–08/07/1993 | QS+AR | Full-disc | 2 | Power law | |
| 8 | K | 1.2 | 2 | 2000 | QS+AR | Centre | ∼470″ × 470″ | 2 | Binning (a) |
| 9 | K | 3 | – | 2005 6 days | AR | Centre | ∼810″ × 810″ | 2 | Power law |
| 10 | K | 3 | 60 | 28/05/1999–31/07/1999 | QS+AR | Full-disc | 1 | Power law | |
| 11 | H | 0.5 | 13 | 27/09/2004 | QS | Centre | 25.5″ × 25.5″ | 1 | Power law |
| 12 | K | 0.6 | 1 | 18/05/2004 | QS | Centre | 300″ × 300″ | 4 | Power law |
| 13 | IR | 16.1 | 2 | 20/04/2015, 13/05/2015 | QS+AR | Full-disc | 1 | Total flux ∝ plage area | |
| 13 | K | 0.35 | – | 1973–1985 | QS+AR | Carrington maps | Total flux ∝ plage area | ||
| 14 | H | 1.8 | 40 | 09/06/2009 | QS | Centre | 50″ × 50″ | 0.1 | Logarithmic |
| 15 | H | 1.1 | 28 | 12/06/2013 | QS | AR | 15″ × 38″ | 0.02 | Logarithmic |
| 16 | K | 2.5 | 131 | 18/05/2010–29/08/2016 | QS+AR | Full-disc | 2 | Logarithmic power law | |
Notes. Columns: reference, spectral line, bandwidth, number and period of observations, type, location, and dimensions of the analysed region, the pixel scale, and the type of relation derived. Dashes denote missing information.
These studies did not derive the functional form of the relation, they simply binned the available datapoints with respect to the magnetic field strength. We note however that the results they presented are approximately consistent with a power-law function.
References. (1) Frazier (1971); (2) Skumanich et al. (1975); (3) Wang (1988); (4) Schrijver et al. (1989); (5) Schrijver et al. (1996); (6) Nindos & Zirin (1998); (7) Harvey & White (1999); (8) Rast (2003b); (9) Ortiz & Rast (2005); (10) Vogler et al. (2005); (11) Rezaei et al. (2007); (12) Loukitcheva et al. (2009); (13) Pevtsov et al. (2016); (14) Kahil et al. (2017); (15) Kahil et al. (2019); (16) This work, see Sect. 3.
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