Geomagnetism and Aeronomy

, Volume 53, Issue 5, pp 663–671 | Cite as

Instrumental data on the sunspot formation in the 17th–18th centuries: Correct information or approximations

  • M. G. OgurtsovEmail author


The available data on the sunspot number derived from telescopic observations are analyzed. It has been indicated that uncertainty in the data on the number of sunspot groups is close to 30% for the 17th century-the early 19th century and reaches a factor of 2 and more in individual years. This means that the above data include limited information on solar activity in the 17th–18th centuries and it is necessary to use external sources (first of all, the data of paleoastrophysics) in order to study this activity in the indicated epoch. Only from the middle of the 19th century, information obtained based on instrumental observations became sufciently accurate for reliable quantitative estimates.


Solar Activity Sunspot Number Instrumental Data Maunder Minimum Wolf Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  1. 1.Ioffe Physical-Technical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Central (Pulkovo) Astronomical ObservatoryRussian Academy of SciencesSt. PetersburgRussia

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