Abstract
The high resolution dynamic spectrogram between 320 and 160 MHz of the Type IV event which started at 13∶35 UT on the 2nd of March 1970 shows a remarkable richness of absorption-emission microstructures. These are morphologically analyzed into structure elements and patterns. The elements are normal and reversed intermediate drift bursts, which we call fiber bursts, medium band shortlived absorptions, broadband shortlived absorptions, broadband wedge shaped absorptions and a, sofar unknown, type which we call tadpole. The patterns are the pulsating structure, sequences of broadband shortlived absorptions, and patterns of almost parallel lines which we call zebra patterns.
During the event a border frequency of about 230 MHz plays an important part, most clearly as a low frequency cut-off for the tadpole zebrapattern and as a zone of phase change in the pulsating structure.
The macrostructure of this event, shown in a composite dynamic spectrogram, reveals features in the decimetric wavelength region that are related with the appearance of tadpole patterns in the region between 220 and 320 MHz.
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Slottje, C. Peculiar absorption and emission microstructures in the type IV solar radio outburst of March 2, 1970. Sol Phys 25, 210–231 (1972). https://doi.org/10.1007/BF00155758
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DOI: https://doi.org/10.1007/BF00155758