Evolutionary relation between type-I bursts on meter waves and flare activity

In this paper, a localised region of the corona which generates a noise storm on meter waves (Type-1 bursts) is called a Type-1 source, and we investigate statistically any evolutionary relation between the production of Type-1 source and the flare activity in the associated plage region. Our data are provided by interferometer (working at 146 MHz) of the Miyun Station of Peking Observatory and our methods consist in a comparison of the evolutionary curves (Time variations) of the intensity of a Type-1 source and of the flare activity as characterized by the f-number. We found that (1) there is indeed an evolutionary relation with typical time lags of 1–2 days between the Type-1 source and the flare activity, (2) some small flares of Class “--” may also be related to Type-1 sources, (3) the S-component at cm waves is related to flare activity, the rise in the f-number before the onset of a proton flare suggesting a pre-heating of the S-component source, and (4) a Type-1 source can be regarded as the after-effect of flare activity.