Abstract
SUNSPOT frequency remains high, and large spots within the range of naked eye vision have averaged, so far this year, one new group in about every ten days. Very large spots, say of area greater than 1,000 millionths of the sun's hemisphere, have been well represented, no fewer than thirteen having been recorded during the eleven months of 1938. A group of spots, first seen near the sun's east limb on November 23 in solar latitude 14° north, grew rapidly in the next few days from 150 milliontchs to 1,950 millionths by November 27. The date of central meridian passage of this large group was November 28-8, and the west limb will be reached on December 5. On December 6, a region of the sun containing another large spot, which was developing during its approach to the west limb, will come into view again at the east limb.
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Another Large Sunspot. Nature 142, 991 (1938). https://doi.org/10.1038/142991c0
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DOI: https://doi.org/10.1038/142991c0