Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..359a&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 6, June 1992, p. 359-366.
Astronomy and Astrophysics
Astronomy
7
Interplanetary Space, Shock Waves, Solar Corona, Type 2 Bursts, Radio Astronomy, Stellar Mass Ejection
Scientific paper
The observational aspect of radio observations of coronal and interplanetary type-II bursts is reviewed, with emphasis on the period from 1985 to the present. The significance of type-II bursts in the energetic flare process is found to be doubtful. Simple timing arguments and the obvious influence of propagation conditions favor the blast wave model. Only the most energetic and massive CMEs, with v greater than 500 m/s, are effective in producing km type-II bursts. Quantitative analysis of the fine structure of type-II patterns is expected to provide a better understanding of wave and particle dynamics at collisionless shocks. Attention is given to three aspects for which the experimental facts should be clarified: the decimetric and metric radio signatures observed in the onset phase of the type-II emission, the interaction between shock waves and particle beams, and the relation between type-II bursts and noise storm chains.
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