Relative timing of hard X-rays and radio emissions during the different phases of solar flares - Consequences for the electron acceleration

Details Relative timing of hard X-rays and radio emissions during the different phases of solar flares - Consequences for the electron acceleration Relative timing of hard X-rays and radio emissions during the different phases of solar flares - Consequences for the electron acceleration

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104..145t&link_type=abstract

(CNR, Workshop on Radio Continua during Solar Flares, Duino, Italy, May 27-31, 1985) Solar Physics (ISSN 0038-0938), vol. 104, M

Physics

39

Electron Acceleration, Solar Flares, Solar Radio Emission, Solar X-Rays, Temporal Distribution, Microwaves, Shock Wave Propagation, Solar Magnetic Field, Solar Radio Bursts, Type 2 Bursts, Vertical Distribution

Scientific paper

Observations relevant to the relative timing of hard X-ray, microwave and lower frequency radio bursts in different phases of flare are reviewed. It is shown that such timing comparisons give important information concerning the electron acceleration/injection process, the magnetic field topology at the acceleration site and the flare development itself. In particular it is shown that acceleration begins before the flash phase of flares and that it keeps going on continuously during the entire duration of a flare. Moreover, despite their wide separation in altitude, hard X-ray, microwave and lower frequency sources appear to arise from a common injection of electrons going on continuously through the different phases of flare. In situ acceleration by shock waves giving rise to type II radio emission is briefly discussed. As an alternative interactions between small and large scale magnetic structures are proposed.

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