11 citations · 22 across the 2 of their papers we have counts for
5 papers
Scale Transfer in 1849 : Heinrich Schwabe to Rudolf Wolf
Shreya Bhattacharya, Laure Lefevre, Hisashi Hayakawa +2
The focus of this study is to reveal the reason behind a scale problem detected around 1849 in the historical version of the International Sunspot Number Series, i.e. version 1 (Le…
A modern reconstruction of Carrington's observations (1853-1861)
Shreya Bhattacharya, E. T. H Teague, S. Fay +3
The focus of this article is a re-count of Richard Carrington's original sunspot observations from his book drawings (Carrington,1863) by an observer from the World data Center-SIL…
A Sunspot Catalog for the Period 1952-1986 from Observations Made at the Madrid Astronomical Observatory
A. J. P. Aparicio, L. Lefèvre, M. C. Gallego +5
Sunspot catalogs are very useful for studying the solar activity of the recent past. In this context, a catalog covering more than three solar cycles made by the astronomers of the…
The umbra-penumbra area ratio of sunspots during the Maunder Minimum
V. M. S. Carrasco, J. M. García-Romero, J. M. Vaquero +4
The Maunder Minimum (MM) was a prolonged period of low solar activity that occurred between 1645 and 1715. The true level of solar activity corresponding to this epoch is still a m…
A Revised Collection of Sunspot Group Numbers
J. M. Vaquero, L. Svalgaard, V. M. S. Carrasco +7
We describe a revised collection of the number of sunspot groups from 1610 to the present. This new collection is based on the work of Hoyt and Schatten (Solar Phys. 179, 189, 1998…