DECAMETER SOLAR TYPE-III BURSTS - DATA CLASSIFICATION WITH USE OF CLUSTER-ANALYSIS

The many-parametric data on decametric type III bursts containing more than 1000 events were classified with use of cluster analysis, i.e., the pattern recognition procedure. For the classification such paramet ers have been used as intensity, duration and degree of circular polar ization derived from burst time profiles. The automatic classification has resulted in division of daily samples of type III bursts into cla sses of bursts, more homogeneous statistically, which can be associate d with different components of type III radiation distinguished by the ir physical origin. For the classes obtained, statistically reliable d ependences of the mean intensity on source position can be found which allow one to conclude about the source structure and evolution, as we ll as about the characteristics defined by a burst generation mechanis m and propagation effects.