Panel a: composite dynamic spectrum at frequencies of 10–240 MHz (top panel) showing multiple Type III radio bursts observed by LOFAR (top) and a Type I noise storm observed by ORFEES (bottom) on 9 July 2013 starting from 11:00 to 11:10 UT. Panel b: zoom in of the dynamic spectrum in (a) focussing on the bright J-burst observed by LOFAR (top) and ORFEES (bottom). The J-burst is denoted by white dashed lines and its components are labelled F1, F2, H1, and, H2. The vertical lines and colour-coded arrows denote the time and frequency, respectively, of the bursts shown in Fig. 2.