How well do we know the sunspot number?
How well do we know the sunspot number?
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我们对太阳黑子数了解多少？
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
L. Svalgaard
中科院分区：
文献类型：
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作者：
L. Svalgaard
摘要我们表明，只有两个调整是必要的，以协调组太阳黑子数与苏黎世太阳黑子数。从20世纪40年代到现在，后者增加了20%，这是由于根据黑子大小对太阳黑子计数进行了加权，并且可以通过增加早期的值来校正。1885年以前的太阳黑子群数偏低了50%。通过这些调整，得到一个单一的太阳黑子数序列。值得注意的是，不再有一个明显的现代大最大值。
Abstract We show that only two adjustments are necessary to harmonize the Group Sunspot Number with the Zürich Sunspot Number. The latter has been increased from the 1940s on to the present by 20% due to weighting of sunspot counts according to size of the spots and can be corrected by increasing the earlier values as well. The Group Sunspot Number before ~1885 is too low by ~50%. With these adjustments a single sunspot number series results. Of note is that there is no longer a distinct Modern Grand Maximum.