Spectral dynamics of mildly relativistic electrons in extended flaring loops

Physics

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Solar Flares: Relativistic Electrons, Microwave Radiation

Scientific paper

The specific task of this work is an analysis of the microwave spectral dynamics of several well-resolved loop-like radio sources with the Nobeyama Radioheliograph (NoRH) at 17 and 34 GHz. The flares were detected as well with the Yohkoh/HXT and the BATSE/CGRO hard X-ray spectrometer. Their hard X-ray spectral index evolution follows to the classical "soft-hard-soft" behavior, typical for most of impulsive flares with simple time profiles. On the contrary, the temporal evolution of the microwave spectral index derived from the emission at 17 and 34 GHz in different portions of the loop-like sources displays "soft-hard-harder" behavior: decrease of its value from the rise phase to the decay phase. These results indicate on the different spectral evolutions of low and high energy electrons in a flaring loop. Some possibilities for such a difference, including processes of acceleration/injection, trapping and scattering, are considered.

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