Analysis of the January 6-11, 1997, CME event

The 1997 January 6 coronal mass ejection (CME) which was associated with only a small disappearing filament (DSF) and weak coronal activity has been studied. Main conclusions are as follows: (1) The DSF under a helmet streamer disrupted the pre-existing streamer, thus resulted in the restructuring of coronal large scale magnetic field and caused the mass in the helmet streamer to form the CME. (2) The energy stored in the filament circuit and the energy of the CME axe estimated and we show that there was enough energy stored in the filament to provide the CME of 6 Jan 1997. (3) From WIND data, we can see that the abundance of He-4(++), (n(He-4(++)/n(H+)) in magnetic cloud is about 1.5%. It means that the magnetic cloud is composed of stream material. This conclusion supports our idea. (4) Interplanetary shock wave is a possible acceleration source of low energy particles (E<100 Mev/nucleun) in this event.