Fig. 6
a) Electron temperature as a function of height in a number of standard models of the solar chromosphere above a sunspot umbra. (i) The model of Avrett (1981), (ii) of Maltby et al. (1986), (iii) of Severino et al. (1994), (iv) of Socas-Navarro (2007), (v) of Fontenla et al. (2009). The thin solid black line (vi) is the reference quiet-Sun atmosphere of Fontenla et al. (1993) known as FAL − C. b) The electron number density as a function of height for the same models as shown in panel a).
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