Response functions of CaLL spectral line intensities to temperature disturbances. I. Computational algorithm for cores of strong lines

Algorithm for computing response functions of Call spectral line intensities to temperature disturbances is analytically presented, and the diagram of computational process is given. The introduced formulation can be related to the particular case of cores of strong chromospheric lines. The algorithm allows for partial redistribution in frequencies and also it fully takes account of deviations from local thermodynamic equilibrium. The known VAL3C model of quiet Sun is used for computational testing.