Fig. 17.
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s index (panels a and d), IRT index (panels b and e), and the brightness temperatures at the mm wavelengths shown in the legend (panels c and f) as a function of filling factors. The filling factors are considered to be 0.0001, 0.005, 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, and 1.0. The upper box shows plots for the sunspot model by Severino et al. (1994) and the lower box, for the plage model by Fontenla et al. (2009).
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