Construction of the light curves for solar flares in the Hα line

The results of an investigation of some factors affecting the construction of the light curves for solar flares in the Hα line are presented. It is determined that the type of the light curve depends on the method of measuring the intensity, the size of the measurement window, and the brightness fluctuations of the quiet chromosphere areas (the reference areas). The light curves constructed on the basis of the flare’s peak intensity show a real picture of the flare development process. A method for the selection of the “reference areas” is suggested.