Fig. 3.
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Radio dynamic spectra observed on 19 September 2011 between 6:00 UT and 7:30 UT. (a) IP type IIIb bursts consisting of stria substructures observed along with multiple regular type III radio bursts by STEREO A & B. (b) Schematic representation of the stria substructures as observed by STEREO A and overlaid on STEREO B and Wind observations. The frequency range (2000–200 kHz) in which the IP type IIIb bursts were observed is indicated by the black frame.
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