In the first part we present the analysis of digitally recorded type-I bursts. The reduction procedure is described and some typical examples and results are presented.
In the second part we propose a model for type-I emission, compatible with low magnetic field strengths.
Incoherent langmuir waves, spontaneously emitted by trapped fast electrons are converted to transverse radiation by coalescence with low frequency whistlers. Recurrent upper hybrid instability in strong m.h.d. pulses explains the bursts in this model.