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Location of narrowband spikes in solar flares View all abstracts by submitter

Arnold Benz   Submitted: 2001-12-14 02:07

Narrowband spikes of the decimeter type have been identified in dynamic spectrograms of Phoenix-2 of ETH Zurich and located in position with the Nançay Radioheliograph at the same frequency. The spike positions have been compared with the location of hard X-ray emission and the thermal flare plasma in soft X-rays and EUV lines. The decimetric spikes are found to be single sources located some 20' to 400' away from the flare site in hard or soft X-rays. In most cases there is no bright footpoint nearby. In at least two cases the spikes are near loop tops. These observations do not confirm the widely held view that the spike emission is produced by some loss-cone instability masering near the footpoints of flare loops. On the other hand, the large distance to the flare sites and the fact that these spikes are all observed in the flare decay phase make the analyzed spike sources questionable sites for the main flare electron acceleration. They possibly indicate coronal post-flare acceleration sites.

Authors: A.O. Benz, P. Saint-Hilaire and N. Vilmer
Projects: Yohkoh-SXT

Publication Status: A+A, 383, 678-684 (2002)
Last Modified: 2005-11-17 01:39
Go to main E-Print page  Temperature Isotropization in Solar Flare Plasmas due to the Electron Firehose Instability  Looptop Hard X-Ray Emission In Solar Flares: Images And Statistics  Edit Entry  Download Preprint  Delete Entry 

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