Association of solar prominences and coronal magnetic sheets from their observed correlation with type III radiobursts

It is shown that coronal structures in which are excited type III bursts (observed with the Nançay radioheliograph) have a good correlation with existence of plage filaments.By accepting that type III bursts reveal the presence of coronal magnetic neutral sheets, an interpretation of results is proposed and discussed in relation with theories of formation of filaments from coronal neutral sheets. It is suggested that the delay of one day observed in several cases between the type III burst occurrence and the filament appearance may be of the order of the filament condensation time from the neutral sheet.