Abstract
A GROUP of sunspots of exceptional size came over the eastern edge of the sun's disk on January 29 and passed central meridian on February 5-6 (when the group was about 33° north of the disk centre) ; it should pass around the western edge on February 11- 12. As the group came fully into view, it was seen to consist of a giant single spot preceded by a large double spot, with a total area, corrected for foreshortening, of 4,900 millionths of the sun's hemisphere on February 1-2. It is unlikely, however, that this huge area will be maintained for long. In several respects, the present group resembles that of January 1926, which had a maximum area of 3,716 millionths and a mean area during the transit of the disk of 3,285 millionths-hitherto the largest group in the Greenwich records, that is, since 1875.
Article PDF
Rights and permissions
About this article
Cite this article
The Great Sunspot and Radio Transmissions. Nature 157, 155 (1946). https://doi.org/10.1038/157155a0
Issue Date:
DOI: https://doi.org/10.1038/157155a0