Christian Horrebow’s Sunspot Observations – II. Construction of a Record of Sunspot Positions
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DOI: 10.1007/s11207-019-1466-y
Abstract: The number of spots on the surface of the Sun is one of the best tracers of solar variability we have. The sunspot number is not only known to change in phase with the 11-year… read more here.
Keywords: record sunspot; variability; sunspot; christian horrebow ... See more keywords
Sunspot Positions and Areas from Observations by Thomas Harriot
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DOI: 10.1007/s11207-020-01604-4
Abstract: The reconstruction of sunspot parameters in the early era of telescopic observations extends our knowledge on visual sunspot activity up to 400 years into the past. 200 digital solar images from 18 December 1610 to… read more here.
Keywords: positions areas; thomas harriot; observations thomas; areas observations ... See more keywords
Sunspot positions from observations by Flaugergues in the Dalton Minimum
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DOI: 10.1093/mnras/stad1489
Abstract: French astronomer Honoré Flaugergues compiled astronomical observations in a series of hand-written notebooks for 1782–1830, which are preserved at Paris Observatory. We reviewed these manuscripts and encoded the records that contain sunspot measurements into a… read more here.
Keywords: positions observations; sunspot positions; flaugergues dalton; dalton minimum ... See more keywords