Studies of impulsive solar bursts observed with high spectral resolution in the range of 18 to 23 GHz

Details Studies of impulsive solar bursts observed with high spectral resolution in the range of 18 to 23 GHz Studies of impulsive solar bursts observed with high spectral resolution in the range of 18 to 23 GHz

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ipespreptq....r&link_type=abstract

M.S. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).

Physics

Microwave Emission, Solar Radio Bursts, Spectral Resolution, Electron Density (Concentration), Magnetic Fields, Solar Flares

Scientific paper

For the first time solar burst in the frequency range of 18-23 GHz have been observed with high time (0.6-1.2 sec) and high frequency resolution (1 GHz) since 1989, by using the Itapetinga 13.7 m diameter antenna. Here, we have investigated the microwave type 'simple low level (less than 100 SFU) bursts' associated with impulsive phase of solar flares. Observed properties of these simple bursts are: rise time tr approximately equals 3 s, decay time td approximately equals 8 s and spectral index ranging between -1 and -4. These bursts were found to be associated with SF or SN flares as seen in H-alpha. Above properties suggest that they are likely to be a microwave counterpart of Elementary Flare Bursts (EFB). In the majority of the cases the spectral evolution is soft-hard-soft. This suggests that a nonthermal gyrosynchrotron mechanism is a likely mechanism for generating these Elementary Flare Bursts. Estimated parameters of these simple burst source are height (h approximately equals 2400 km), electron density (N is less than 8,8 x 10 cm ) and magnetic field (B approximately equals 310 Gauss).

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