Table 1.
Analysed ARs and their computed parameters using the magnetic barycentres and CoFFE.
| AR | Sign(T) |  |
 |
 |
Δϕa / day | Δϕc / day |  |
|---|---|---|---|---|---|---|---|
| 9574 | + | −2° ± 3° | 10° ± 6° | 13° ± 6° | 0.2° | −3.9° | 5.4 |
| 9748 | − | 26° ± 4° | 20° ± 5° | 5° ± 2° | −0.3° | −2.7° | 5.3 |
| 9906 | + | −10° ± 4° | 2° ± 2° | 9° ± 3° | 2.2° | 0.9° | 5.5 |
| 10268 | − | −1° ± 16° | 10° ± 9° | 13° ± 9° | −6.0° | −2.6° | 5.5 |
Notes. Column one and two show the AR NOAA number and the twist sign [sign(T)] derived from the magnetic tongues. Columns three to seven list the values of the mean ϕa and ϕc, the mean difference between both tilt estimations [
], and the variation of the tilt angle [Δϕa] and [Δϕc] per day; all these values are expressed in degrees. Finally, the right column shows the mean number of iterations [
] required for the computations. The errors reported in columns three to five correspond to the standard deviation of the temporal averages. The values correspond to p = 0.
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