Abstract
A RECENT SUNSPOT.—A large group, typically ‘bipolar’ in appearance, has recently been under observation. The group was conspicuous on account of the size and regularity of the leader spot, which exceeded 700 millionths of the sun's hemisphere. There was a cluster of spots forming the other extremity of the group 15° of longitude behind the big spot. On Nov. 4, when the group was near the east limb, Mr. Newbegin noticed a bright reversal of the C-line of hydrogen in the preceding part of the umbra of the leader spot, and he also detected dark filaments between it and the cluster of spots in the rear. These latter spots seemed to be associated with a metallic prominence seen at the east limb on Nov. 3. No associated magnetic disturbance was recorded about the time of central meridian passage of the group on Nov. 9, further particulars of which are as follows:
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Our Astronomical Column. Nature 122, 783 (1928). https://doi.org/10.1038/122783a0
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DOI: https://doi.org/10.1038/122783a0