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Astron. Astrophys. 342, 271-278 (1999)

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Dynamics of subrelativistic electron beams in the solar corona

Type III group analysis

A. Hillaris 1, C.E. Alissandrakis 2, J-L. Bougeret 3 and C. Caroubalos 4

1 Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, GR-15784 Athens, Greece (e-mail: ahilaris@atlas.uoa.gr)
2 Section of Astro-geophysics, University of Ioannina, GR-45110 Ioannina, Greece
3 Observatoire de Paris, Department de Recherche Spatial, CNRS UA 264, F-92195 Meudon Cedex, France
4 Department of Informatics, University of Athens, GR-15783 Athens, Greece

Received 1 December 1997 / Accepted 27 October 1998


A number of type III groups is studied. Wave particle interactions are neglected and the so called drift approximation is used to model the electron beam evolution. We extrapolated the observed Flux-Time profiles towards higher frequencies and estimated the injection time for the individual beams responsible for the excitation of the type III's. A simple clustering algorithm , based on the temporal separation of nearest neighbour injections as a proximity criterion, was used to identify patterns of burst subgroups within the type III groups. The question of whether the acceleration and injection of component bursts exciters is coherently modulated in a single source, or this process is driven by a statistical flare in a spatially fragmented energy release site, is addressed.

Key words: Sun: activity – Sun: corona – Sun: radio radiation

Send offprint requests to: A. Hillaris

© European Southern Observatory (ESO) 1999

Online publication: December 22, 1998