Abstract
An Active Region on the Sun.—Although the maximum of the present cycle was reached in 1928, the sun has shown considerable activity during the past three months in the appearance of several large spots (see NATURE, Oct. 19, p. 631, Nov. 9, p. 737, Dec. 7, p. 888, Dec. 28, p. 998). During the latter part of December, another group of spots crossed the disc, covering with its attendant faculæ a great extent of the sun's surface. The group (or possibly two separate but allied groups), which consisted of a long stream extending over 18° of longitude or 130,000 miles, occupied the place of the big naked-eye spot, No. 16 of the previous rotation, which also was the return of a complex stream beginning its development on Oct. 30. Notes relating to the early history of this active region are given in the Observatory for December last, p. 365.
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Our Astronomical Column. Nature 125, 26 (1930). https://doi.org/10.1038/125026a0
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DOI: https://doi.org/10.1038/125026a0