We present the results of time serie analysis on the Halpha, HeI
(lambda 5876 \AA) and Na D (lambda 5890, 5896 A) profile
variations in two active T Tauri stars, DL Tau and DR Tau. The data
obtained in the INT (La Palma Observatory) with the Intermediate
Dispersion Spectrograph (lambda/(Delta lambda) > 25 000) includes
repeated observations on time scales of one day in two bands
quasi-simultaneously
For the three lines we have analysed the time variability of the equivalent width and of the profile using in this case both the normalized variance and correlation matrix analysis. The aim is the study of time behaviour of these lines as well as possible correlations among them. The observed profiles of some lines are very complex, often showing characteristics of outflows as well as of accretion. We have also studied the veiling by comparing our targets with template stars.
Finally we show that the variability in the two stars are different suggesting different structure of their environments.