From the spectral material obtained in the spectroheliograph of San Miguel, between June 1969 and April 1970, 33 flares with emissions in the umbra and/or penumbra of solar spots have been selected. It has been studied the behaviour of the K line of Ca II. It is indicated a classification of the observed cases. Particularly, in the emission on the umbras it can be noticed a net pick in emission centered in K3, the disappearance of the double inversión K2 and the narrowing of the profile observed in faculas.Asociación Argentina de Astronomí