  We present results of a systematic search for X-ray flares on young stars
observed during ROSAT PSPC observations of the Taurus-Auriga-Perseus region.
All pointed PSPC observations currently available from the ROSAT Public Data
Archive with known T Tauri stars, Pleiads, or Hyads in the field are analyzed
in order to study the evolution of coronal activity. 38 large flares can be
attributed to late-type stars. A flare rate is derived for the different
stellar samples making use of the flare duration and the observing time. We
investigate the influence of stellar parameters such as age, rotation and
multiplicity on individual flare parameters and the flare frequency.
