Observations of narrow band solar burst structure at decameter wavelengths

A high-speed digital solar radio spectrograph was used in the investigation. This instrument made it possible to observe solar bursts with a time and frequency resolution not obtainable with conventional sweep-frequency spectrographs. A type III burst observed at 40 MHz is shown. The rise and the decay of the type III burst is smooth and gradual, with the decay time exceeding the rise time. An isophote diagram of the same burst is also presented along with some other events.