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Fig. 1.

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Composite dynamic spectrum showing the evolution of the type II radio burst observed on 2022 May 19. The spectrum combines observations from three instruments: ORFEES (300−800 MHz), LOFAR HBA (110−240 MHz), and LOFAR LBA (30−88 MHz). The event starts at 12:02 UT with a single emission lane at frequencies around 600 MHz and drifts to lower frequencies. The top-right inset shows a zoomed-in view of the region where the single/double lane begins to evolve into a multilane structure. The multilane structure becomes particularly evident in the LOFAR LBA frequency range (30−88 MHz) after 12:08 UT. Note that F and H emissions are superposed at high frequencies, and in the LBA range they are distinct. The frequency range is plotted on a logarithmic scale to better display the fine structures across the wide frequency range.

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