The characteristics of microwave burst source and energy budget in disappering filament Original Research Article

On 7 May, 1992 a complex event with the disappearence of a filament and a two ribbon flare was well observed in Hα filtergrams, Yorkoh soft X-ray data, and radio data. This event is studied by using the flare-filament current model. The momentum equation and the energy equation of the filament current have been solved. By using the measured time variation of the filament height, the corresponding evolution of the current intensity and the total energy of the current filament were computed. The magnetic field strength and the energy flux of energetic electrons in the source region of microwave bursts have also been estimated by using the microwave spectrum. During the main phase, the mean magnetic strength and the energy flux of energetic electrons are about 300–400G and 1 × 1011 erg cm−2s−1, respectively. By using these physical parameters, the energy budget has been made. These results show that the flare of 7 May, 1992 may be the result of reconnection of current sheet beneath the disappearing filament and the flare energy is provided by current filament.