... About ATNF overview . ... Type III bursts typically start in the corona at frequencies of order 100 MHz, often as fundamental and harmonic bands differing in frequency by a factor , and then drift downwards in frequency as the driving electrons move out into the increasingly dilute plasma of the solar wind (Figures 1 and 2 ). ... Figure 5 b demonstrates that SGT describes very well the bursty Langmuir waves observed in the source region of one interplanetary type III burst (Robinson et al. ...