Solar Microwave Bursts from Electron Populations with a `Broken' Energy Spectrum

Details Solar Microwave Bursts from Electron Populations with a `Broken' Energy Spectrum Solar Microwave Bursts from Electron Populations with a `Broken' Energy Spectrum

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998soph..181..337h&link_type=abstract

Solar Physics, v. 181, Issue 2, p. 337-349 (1998).

Physics

9

Scientific paper

Usually the gyrosynchrotron emission of microwave bursts from electron populations with a power-law (PL) energy distribution has been considered under the assumption that the spectral index of the distribution is constant over a wide range of energies. Meanwhile, there is strong evidence, in particular from hard X-ray and gamma-ray, but also from cm/mm wavelength radio observations, that in many solar flare events the spectrum of the emitting electrons is characterized by a significant hardening at energies above 100-500 keV. We present some examples of calculated microwave burst spectra at cm/mm wavelengths taking into account the above evidence. It is shown that a break in the energy spectrum of the PL electrons can indeed result in a spectral hardening sometimes observed in microwave bursts at frequencies above 10-30 GHz.

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