Non-LTE analysis of fluorescent iron lines in solar flares

Results of non-LTE modeling of anomalous strengthening of the lines 4063, 4132 Fe I(43), excited by the blend H(epsilon) + HCaII in solar flares, are given. The radiation field in this blend is represented by the Planck function. Statistical equilibrium and radiation transport equations are solved simultaneously for the 20-level model of the iron atom. The behavior of the coefficients of departure from LTE values in flare models and in the quiescent sun model is similar. The superionization effect of Fe I is noted. The best agreement between observed and calculated intensity ratios for fluorescent and normal Fe I lines is achieved with the radiation field in the blend H(epsilon) + HCaII, which has temperatures of 6150 and 7150 K for weak and strong flare models, respectively.