[en] The relationship between coronal green line emission and solar sector magnetism has been studied statistically for the years 1965 to 1969. This period includes the rising portion and the maximum phase of solar cycle no. 20. In the years around solar maximum the results suggest the existence of longitudinal magnetic arcades at the solar sector boundaries. The arcades extend from at least 50⁰N to 50⁰S and are flanked by north-south oriented coronal holes about 90⁰ apart. In the rising portion of the cycle the general picture consists of a high green line intensity structure to the west of the boundary and a region of low intensity several days wide to the east of it. Analyses of the calcium plage distribution in the years 1962 to 1969 show that, on the average, there is a tendency for the plage activity to peak near the sector boundaries. It is further concluded that the activity distribution suggested by Wilcox (1971) is not typical of the behaviour of solar activity relative to the sector boundaries. (author)