Table 4
Best-fit values for the hyperparameters of the covariance function in Eq. (1), derived from a GP analysis of the S activity index time-series using 100 random walkers.
| Hyperparameter | Value | Prior |
|
|
||
| λ [days] | 30.9 ± 4.9 |  (0, +∞) |
| w | 0.099 ± 0.011 | (0, +∞) |
| θ [days] | 29.2 ± 0.19 | (25, 50) |
Notes. They are calculated as medians of the marginal posterior distributions, and the uncertainties represent their 16% and 84% quantiles. The priors used in our MCMC fitting are also shown. The symbol (·,·) denotes an uninformative prior with corresponding lower and upper limits.
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