Solar Radio Bursts with a Spectral Flattening at Millimeter Wavelengths

Details Solar Radio Bursts with a Spectral Flattening at Millimeter Wavelengths Solar Radio Bursts with a Spectral Flattening at Millimeter Wavelengths

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995soph..160..181c&link_type=abstract

Solar Physics, Volume 160, Issue 1, pp.181-198

Physics

18

Scientific paper

An analysis of solar radio burst spectra in the range 3 80 GHz is carried out using measurements of the observatories at Bern and Nobeyama supplemented by data from worldwide network stations. Special interest was focused on strong events at frequencies above 30 GHz. It is found that there exists an extended group of events with a flattening of the spectra at millimeter wavelengths. In particular, two types of flattening are observed: (i) a high-frequency flattening either following a monotonic spectral flux increase at cm-waves or forming a flat broad-band spectrum at mm-wavelengths ; (ii) a millimetric flattening as a decrease of the slope (i.e., a hardening) of the descending branch of the spectrum having a peak in the microwave range. Besides this, in complicated bursts a strong temporal evolution of millimeter spectra may occur resulting in either type of the flattening. Some factors capable of producing the millimeter flattening are considered: (1) superposition of multiple source regions of gyrosynchrotron radiation, (2) gyromagnetic radiation from a two-component energy spectrum of the accelerated electrons at high energies, or by a temporal hardening of the electron spectrum during extended flares, and (3) optically thin bremsstrahlung of evaporated plasma.

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