Event SOL2003-11-03T09:43:20 recorded by the ARTEMIS-JLS/ASG and ARTEMIS-JLS/SAO receivers. The Dynamic spectrum of the entire event from ARTEMIS-JLS/ASG is presented in the upper panel. Middle panel: we show the SAO dynamic spectrum and in the lower panel, its time derivative inside the 5 min box of the upper panel. The dashed white horizontal lines on the spectrum mark three of the frequencies (327, 410.5, and 432 MHz) of the Nançay radioheliograph (NRH) channels. The boxes indicate selected segments of spike chains, (A, B, C & D) which are studied in this work (shown enlarged in Figs. 3–5).