Gyrosynchrotron Process of a Rare Large Type-Ⅳμ Burst Associated with Coronal Mass Ejection

A large Type Ⅳμsolar radio burst was observed at Yunnan observ ato ry on December 16, 1988.The burst was associated by a coronal mass ejection (CME)with the radio signature of Type Ⅱ and Type Ⅳ bursts.On the basis of Beijing Huairou magnetogram of AR5278, powerlaw distribution of electrons of the source region is calculated.It is suggested that the Type Ⅳμ burst associated with CME was due to the gyrosynchrotron radiation of high energy electrons trapped by magnetic field.Finally, some quantitative and qualitative explanations are proposed.