New reconstruction of the sunspot group numbers since 1739 using direct calibration and “backbone” methods
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| Description | scientific article published in Astronomy and Astrophysics |
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author: Ilya G. Usoskin Theodosios Chatzistergos Gennady A. Kovaltsov Sami Solanki Natalie A Krivova |
| Publication date | June 2017 |
| Language | English |
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| Missing/wrong data? | Edit Wikidata item |