The United States Air Force solar observing optical network (SOON) sunspot areas have been reported by several researchers over many years to be underestimated by as much as 50 per cent. Here, the areas of sunspots from scanned SOON disc drawings have been accurately remeasured for a period of two months from 2014 October and November – this being near the peak of Solar Cycle 24 and which includes the largest sunspot group of that cycle. The remeasured sunspot areas are now comparable with areas in sunspot catalogues.

中文翻译：

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太阳观测光网络黑子区的重新测量

多年来，一些研究人员报告说，美国空军太阳观测光网络（SOON）黑子区被低估了多达50％。在这里，从2014年10月和11月开始的两个月内，已准确地重新测量了扫描的SOON光盘图纸上的黑子区域-这接近太阳周期24的高峰，并且包括该周期中最大的黑子组。现在，重新测量的黑子面积与黑子目录中的区域相当。