Abstract
FOR the third time within a month, a new group of sunspots large enough to be seen with the naked eye has appeared, and is in transit across the sun's disk from November 26 until December 9, the date of central meridian passage being December 2·1. The area of the present group, which consists of a long stream of spots over 100,000 miles in length with a large component in the middle, increased from about 400 millionths of the sun's hemisphere on November 27 to 1500 millionths on November 29. Since the typical curve of growth of large spots shows the maximum area to be reached between the fifth and tenth days after their initial formation, it is probable that the group may grow still larger before it disappears around the western limb. In any event, a maximum area of 1500 millionths has not been equalled since February 1933, when the last big group of the preceding cycle (ending about 1933·8) was recorded.
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Another Large Sunspot. Nature 136, 907–908 (1935). https://doi.org/10.1038/136907f0
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DOI: https://doi.org/10.1038/136907f0