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Solar activity reconstruction from the Georg Eimmart archive of 1616 – 1720

Published online by Cambridge University Press:  23 December 2024

Nadezhda V. Zolotova Open the ORCID record for Nadezhda V. Zolotova [Opens in a new window]  and
Mikhail V. Vokhmyanin
Nadezhda V. Zolotova*
Affiliation:
St. Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
Mikhail V. Vokhmyanin
Affiliation:
Space Climate Group, Space Physics and Astronomy Research Unit, University of Oulu, PO Box 3000, 90014 Oulu, Finland
*
email: [email protected]
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Abstract

Historical sunspot records provide piece by piece more information on solar variability on a centennial scale. In this work, we analyze sunspot observations from the archives of Georg Christoph Eimmart, which is the second-richest data set of the Maunder minimum after the archives of the Paris observatory. Comparing the dates of the blank solar disk from the database by Hoyt & Schatten (1998) with dates of observations at the Eimmart observatory, we find that spotless days reports originate from astrometric observations. A comparison of the observations by La Hire and Müller of 1719 suggests that the observations by La Hire were for astrometric purposes as well, rather than aimed at sunspot counting.

Keywords

History and philosophy of astronomy(Sun:) activity(Sun:) sunspots
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 355 - 358
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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References

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