Study of Primary Type Ⅲ Burst Sources

Two dimensional observations of Nine primary type Ⅲ burst sources obtained at 169 MHz with the Mark Ⅲ Nanca Radioheliograph are presented. The resolution of time is 0.04 second. In the E. W. direction, the half power resolution is 1.2. In the N. S. branch is comprised between 2.7 and 4.3. The primary type Ⅲ burst sources are structureless sources.