Fig. 2.
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Overview of 20–5000 MHz radio spectrum in the time interval 13:20–13:32 UT observed during the 2 April 2022 flare. Top to bottom, the panels show the 10–100 MHz Greenland-Callisto spectrum, the 150–1000 MHz ORFEES spectrum, and the 800–2000 and 2000–5000 MHz Ondřejov spectra. Horizontal emission bands are due to terrestrial artificial sources.
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