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An Active Sunspot

Nature volume 140, pages 616641 (09 October 1937) | Download Citation

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Abstract

A LARGE and active group of sunspots, visible to the naked eye, is in transit across the sun's disk (September 28–October 11) in latitude 10 ° N. The date of central meridian passage was October 4·6. The following measures of area made at Greenwich and expressed in millionths of the sun's hemisphere illustrate the rapid growth of the group from September 28, when it was seen coming into view at the sun's east limb:

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https://doi.org/10.1038/140616f0

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