On the origin of δ spots

摘要: Mount Wilson sunspot drawings from 1966 through 1980 were used in conjunction with Hα filtergrams Big Bear Solar Observatory to examine the origin of δ spots, spots bipolar umbrae within one penumbra. Of six cases we studied, five formed by union non-paired spots. They are either shoved into another two neighboring growing bipoles or a new spot born piggy-back style on an existing opposite polarity. Proper motions take curvilinear paths around avoid collision. This is shear motion observed (Tanaka, 1979). In remaining case, was that emerged as pair. Our findings indicate no intrinsic differences formation behavior between and normal magnetic configuration.