A long-enduring multi-source burst at 17 GHz and its relation to a type IV/m-dm/ burst with spectral fine features

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Astronomical Spectroscopy, Microwave Spectra, Solar Protons, Spectral Line Width, Type 4 Bursts, Brightness Distribution, H Alpha Line, High Temperature Plasmas, Solar Flares, Spatial Distribution, Thermal Emission

Scientific paper

A proton-event-associated microwave burst that occurred on November 10, 1978, and was observed with the 17 GHz interferometer at Nobeyama (Japan) is discussed. The burst had a very broad extent (about 4.5 arcmin) and consisted of at least four separate sources. The time evolutions of the individual sources were almost independent of one another. It is suggested that the sources are of two distinct types. The first, comprising the two-ribbon-associated sources, is characterized by a source expansion in size and a relatively flat microwave spectrum, both of which can be explained by thermal emission from hot condensed plasma in the magnetic arcades whose legs are seen as the two-ribbon H-alpha flare. The second type, comprising spot-related sources, is characterized by a high polarization degree with a compact unipolar structure, rapid time variation, and a microwave spectrum having the shape of an inverted U.

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