Spectral features of large type IV bursts and interrelation to solar-terrestrial phenomena

Abstract

The type IV burst phenomenon consists of at least five physically distinct components or phases. Concerning the spectral and polarization characteristics of the radio emission, the X-ray emission and the association of energetic particle emission, two main classes of type IV burst components can be distinguished. The first class associated with energetic particle events comprises the (especially hard) X-ray burst, the type 1V/z and mA1 components. With respect to the dynamics of the burst source a 'quasistationary' mAl-phase can be distinguished from a 'moving' mA2-phase. The general tendencies of the development of large type IV events have been discussed with regard to the possibility of the occurrence of neutral points of the magnetic field in greater coronal heights.

Radio Evidence on the Particle Distribution Functions in the Corona following Flares

“…Although a definitive study has not yet been carried out, it appears that FC II bursts are very closely associated with proton events observed by spacecraft. The observed characteristics and the interpretation of these bursts have been given by Pick (1961), Akinyan et al (1971), Bohme (1972, Smerd (1975), Magun et al (1975) and Robinson (1977).…”

Radio Astronomical Tools for the Study of Solar Energetic Particles I. Correlations and Diagnostics of Impulsive Acceleration and Particle Propagation

“…The SEP-associated microwave bursts were found to have long duration (Kundu and Haddock, 1960;Sakurai and Maeda, 1961;Kahler, 1982a), which means that the microwave emission is in general the high-frequency part of a type IV burst. The necessity of both microwave and meter-wave emission, which signals the escape of particles to the high corona, was emphasized by Castelli et al (1967), Akinyan et al (1971), and Castelli and Barron (1977).…”