Radio Bursts and Associated Flare/CME events: the 2002 March 17 Event

Details Radio Bursts and Associated Flare/CME events: the 2002 March 17 Event Radio Bursts and Associated Flare/CME events: the 2002 March 17 Event

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh24a..04p&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH24A-04

Astronomy and Astrophysics

Astronomy

6954 Radio Astronomy, 7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114)

Scientific paper

Coronal Mass Ejection (CME) events are frequently associated with complex radio emissions which are detected in a broad frequency range; their radiating sources often spread over a large range of latitude and longitude. We performed a spectral and imaging data analysis of several flare/CME events which were associated with long-duration type III-like radio bursts. We illustrate our results by describing more particularly the solar event of March 17, 2002. At metric wavelength, the radio burst group lasted for more than 15 minutes and was closely correlated with a hard X-ray emission. The Nancay Multifequency Radio heliograph observed the progression of the emitting radio sources from the low corona in the vicinity of the X-ray source, to a projected distance of one solar radius. These sources were distributed along and near the inward direction of the CME edge which overlaid the X-ray source. They move outwards in the same direction as the CME with a projected speed of 600 km/s. We performed a potential magnetic field extrapolation and found that the electrons generating the type III bursts are injected along open magnetic field lines near the interface between close and open magnetic field regions. We discuss different scenarios which take into account simultaneously the correlation between the hard X-ray and radio bursts, the progression of the radio sources and their link to the expansion of the CME. We conclude on the interest of these results for future solar- terrestrial investigations.

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