Physics – Space Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ijrsp..19..506k&link_type=abstract
Indian Journal of Radio and Space Physics (ISSN 0367-8393), vol. 19, Oct.-Dec. 1990, p. 506-518.
Physics
Space Physics
2
Solar Corona, Solar Radio Bursts, Stellar Mass Ejection, Magnetohydrodynamic Turbulence, Solar Limb, Solar Prominences, Type 2 Bursts, Type 4 Bursts
Scientific paper
The radio signatures and properties of coronal mass ejection (CME) events are discussed. The signatures are mostly in the form of type 2 and type 4 burst emissions. Although type 2 bursts are temporally associated with CMEs, it is shown that there is no spatial relationship between them. It is shown that moving type 4 and type 2 bursts can be associated with slow CMEs with speeds as low as 200 km/s, contrary to the previous belief that only CMEs with speeds greater than 400 km/s are associated with radio bursts. A specific event is discussed in which the CME and type 4 burst had nearly the same speed and direction, but the type 2 burst location was behind the CME and its motion was transverse. The speed and motion of the type 2 burst strongly suggest that the type 2 shock was decoupled from the CME and probably due to a flare behind the limb. Therefore only the type 4 source could be directly associated with the slow CME.
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