Solar radio spectra between 160 and 320 MHz

Dynamic spectra of incremental solar radio emission reveal that (mostly faint) pulsating and morphologically similar structures, including patterns of bright spots, dominate between ca. 250 and 320 MHz. As individual bursts these bright spots are similar to Type I bursts but they appear in an entirely different environment. This kind of activity is indicative of Type IV emission and seems to favour the generation of Type III bursts. Often its boundary with storm activity at the lower side of the band is rather sharp.