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(1 + cos 2 0)/|cos0|for 0 <, 71°, and -T 0 + T X > 1 for 0 £ 71°, where 0 is the angle of propagation of the radiation with respect to B. The degree of circular polarization in the sense of the O-mode for radiation emerging from the source region is plotted as function of 0 in Figure 2. Conclusions and DiscussionA plasma radiation theory 22 of type I solar radio bursts has been outlined. Preferential amplification of O-mode radiation in the source region has been proposed as an explanation for the strong circular polarization of the bursts.In treating amplification, the magneto-ionic modes are assumed to be negligibly coupled, which requires that ho " Vxl^lc^ (g row th length)" 1 , where t? 0 and T? X are Omode and X-mode refractive indices. In the case considered, this leads to the condition £2 e | cos01 /<*; > 10" 6 , which is likely to be satisfied in the present context. A similar condition might not be satisfied by type HI bursts whose polarization has been observed to be weak.