Abstract
TWO large groups of sunspots were conspicuous on the sun's disk during the past week. The larger of these groups, in latitude 4° south, appeared over the sun's east limb on July 3 and became a complex group with an area exceeding 1700 millionths of the sun's hemisphere. Its time of central meridian passage was July 9.3 U.T. the other group arose from a pair of tiny spots seen on July 4 in north latitude 6°. Shortly after its central meridian passage on July 8.2, it had reached an area of 1000 millionths.
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Two Large Sunspots. Nature 144, 109 (1939). https://doi.org/10.1038/144109e0
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DOI: https://doi.org/10.1038/144109e0