Spectral behaviour and proton effects of the type IV broad-band continua

The spectral behaviour of a group of broad-band continua at metre and decametre waves is discussed. These broad-band continua are polarized in the extraordinary mode and occur during the explosive phase of some strong flares. The time behaviour of the broad-band continua and of the moving type IV bursts was already compared in a previous paper (Böhme, 1972). It is pointed out in the present paper that the broad-band continua differ from the moving type IV bursts not only regarding their time behaviour but also with reference to some spectral characteristics. Moreover, the broad-band continua differ from the moving type IV bursts by their close relation to proton events. It can be concluded that the high-energy protons are accelerated in different steps. An important secondary acceleration mechanism acts above the emission level of the type IV bursts.