Efficiency of electron acceleration by shock waves in the solar corona according to observational data on the fine structure of type II radio bursts.

Details Efficiency of electron acceleration by shock waves in the solar corona according to observational data on the fine structure of type II radio bursts. Efficiency of electron acceleration by shock waves in the solar corona according to observational data on the fine structure of type II radio bursts.

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998r%26qe...41..107z&link_type=abstract

Radiophys. Quantum Electron., Vol. 41, No. 2, p. 107 - 114

Physics

Solar Radio Bursts: Plasma Diagnostics, Solar Radio Bursts: Structure, Solar Corona: Particle Acceleration

Scientific paper

Herringbone bursts (HB-bursts) are the type III-like fine structure in type II bursts of solar radio emission and are usually interpreted as plasma radiation arising from fast electrons accelerated by shock waves in the solar corona. In general outline, the radiation mechanism of HB-bursts is similar to that of type III bursts. However, HB-bursts have brightness temperatures that are about an order of magnitude higher than those of type III bursts. The frequency drift of HB-bursts is about two or three times lower than that for type III bursts. All this shows that the fast-electron beams responsible for HB-bursts and type III bursts differ markedly in their parameters. The authors calculated expected brightness temperatures of HB-bursts at the fundamental and second harmonic and compared their results with Culgoora radiometer and radioheliograph data and Tremsdorf spectrograph data in order to estimate parameters of fast-electron beams generating HB-bursts. They found that the observed brightness temperatures of HB-bursts give velocities of fast electrons accelerated by shock waves within the limits (0.02 - 0.17) c. These velocities are several times lower than those for type III bursts (0.15 - 0.5) c. The density of the fast electrons responsible for HB-bursts exceeds by 1 - 2 orders of magnitude the relative densities in type III sources. This gives a clue to understanding the markedly higher brightness temperatures of HB-bursts compared to those of type III bursts. The authors concluded that the parameters obtained for the agent exciting HB-bursts favor turbulence mechanisms of electron acceleration by shock waves in the solar corona.

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