The Neutral Current Sheet and Its Radiation Pairs of Side Sources in Coronal Mass Ejections

Using the data observed with the soft X-ray telescope, hard X-ray telescope aboard on Yohkoh and the Nobeyama Radioheliograph on 1998 April 23, a comprehensive study on soft X-ray coronal mass ejection(SXRCME) and radio Type Ⅳ burst is carried out and some significant results are obtained as flollows:A magnetic capacity belt(MCB)between two magnetic dipole sources(MDSs)was found and there were only a few activation sources(ASs). During the MCB changed into a magnetic energy belt(MEB)by the ASs, activating energy and shining material both concentrated to the neutral current sheet(NCS)in the course of its formation. When two MDSs were put through by the MEB, the NCS formed and the SXRCME occurred. The matter ejected not only form the NCS, but also from the whole MEB. The expanding loop of the SXRCME had two foot points, both were just two MDSs. The head of the expanding loop always tended to the foot point of the weak source, because it was equilibrium point of magnetic pressures coming from two foot points. For this reason, its locus was neutral line. From this, the neutral line can also determine the position of NCS. Finally, the radiation pairs of side sources of NCS on the MEB are found.