Radio and Coronagraph Observations: Shocks, Coronal Mass Ejections and Particle Acceleration

Details Radio and Coronagraph Observations: Shocks, Coronal Mass Ejections and Particle Acceleration Radio and Coronagraph Observations: Shocks, Coronal Mass Ejections and Particle Acceleration

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spro.proc..187p&link_type=abstract

Solar Physics with Radio Observations, Proceedings of the Nobeyama Symposium, held in Kiyosato, Japan, Oct. 27-30, 1998, Edited

Physics

5

Scientific paper

Study of radio emissions which are due to accelerated electrons can provide important diagnostics on various problems. This review focuses mainly on the contribution of radio observations obtained at meter and longer wavelengths to the present knowledge of Coronal Mass Ejections (CMEs). The three main topics which are discussed in this review are the production of shocks as revealed by type II bursts and their relationship with flare-CME events, the onset and development of CMEs and finally the particle acceleration and the association with flare-CME events. An important question which is discussed is how the recent observations support the idea that coronal and interplanetary type II bursts are of independent origin. In the absence of a flare, past studies had found a close spatial and temporal relationship between noise storm enhancements and white light transient activity. Recent observations show that the spatio temporal evolution of noise storms in relationship with magnetic, XUV and coronagraph observations are deeply interesting for the understanding of coronal evolution. For flare-CME events, the observations show a clear connection between radio burst emissionand CME development. One can identify successive sequences in the evolution of the transient coronal activity associated with the CME development. It is emphasized that the association between CMEs, flares and accelerated particles is far from being fully understood. Observational evidence for long term coronal acceleration process is shown in this review. It is also discussed that a CME can be associated with several coronal sites of particle acceleration which are distributed over a wide volume. CMEs can also contribute to the fast particle transport from the acceleration sites to the interplanetary medium. These results agree with the fact that SEP events may contain particles of coronal origin.

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