Overview of the X-ray flux and LOFAR dynamic spectrum for the observation on 17 October 2015. a: GOES X-ray lightcurves for the duration of the LOFAR solar observation. Minimal activity other than a number of C-class flares prior to 13:00 UTC is observed. Red vertical lines indicate the time range of the radio analysis. b: dynamic spectrum of a Type III solar radio burst observed with LOFAR station RS509. We note the striations in frequency that are particularly apparent below 40 MHz. The inset is a zoom-in of the region in the white box, which shows striation in the burst. The white cross indicates the time and frequency at which the images described in Sect. 3 are made.