A 3B Flare on SePt.8 in 1980 and Its Mass Ejection

A 3B flare on sept. 8 in 1980 and its mass ejection are analysed in detail. The main results of the analysis are as follows. (1) The flare had flash phase and its maximum intensity was about 4 times more than that of the undisturbed region. (2) The flare had the double-ribbon structure and two ribbons moved apart at the velocity of 60km/sec. (3) The mass ejection of the flare had the loop structure. The height of the top of the loop structure reached 105km. The velocity of the mass ejection was about 427 km/sec (at the height 1.1×10⁵km). (4) The radio emission of the flare in short wave bands preceded that in long wave bands probably the emission has relation to the loop-shaped mass ejection.