Christian Horrebow’s Sunspot Observations – I. Life and Published Writings
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DOI: 10.1007/s11207-019-1465-z
Abstract: Between 1761 and 1776, Christian Horrebow made regular observations of sunspots from Rundetårn in Copenhagen. Based on these observations he writes in 1775 that “it appears that after the course of a certain number of… read more here.
Keywords: observations life; horrebow; sunspot observations; horrebow sunspot ... See more keywords
Unaided-eye Sunspot Observations in 1769 November: A Comparison of Graphical Records in the East and the West
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DOI: 10.1007/s11207-019-1488-5
Abstract: Sunspots can be seen with the unaided eye when they are sufficiently large. Due to the known correlation between the occurrence of unaided-eye sunspot observations and the phase of the solar cycle, these observations frequently… read more here.
Keywords: 1769 november; unaided eye; eye sunspot; sunspot observations ... See more keywords
Reanalyses of the sunspot observations of Fogelius and Siverus: two ‘long-term’ observers during the Maunder minimum
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DOI: 10.1093/mnras/staa2965
Abstract: The solar activity during the Maunder Minimum (MM; 1645 -- 1715) has been considered significantly different from the one captured in modern observations, in terms of sunspot group number and sunspot positions, whereas its actual… read more here.
Keywords: maunder minimum; long term; reanalyses sunspot; sunspot observations ... See more keywords
Sunspot observations by Hisako Koyama: 1945–1996
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DOI: 10.1093/mnras/stz3345
Abstract: The sunspot record is the only observational tracer of solar activity that provides a fundamental, multi-century reference. Its homogeneity has been largely maintained with a succession of long-duration visual observers. In this paper, we examine… read more here.
Keywords: observations hisako; hisako koyama; 1945 1996; sunspot observations ... See more keywords