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Sunspot Catalogue of the Valencia Observatory (1920-1928)
V. M. S. Carrasco, J. M. Vaquero, A. J. P. Aparicio +1
A sunspot catalogue was maintained by the Astronomical Observatory of Valencia University (Spain) from 1920 to 1928. Here we present a machine-readable version of this catalogue (O…
Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876-1986)
A. J. P. Aparicio, J. M. Vaquero, V. M. S. Carrasco +1
The solar program of the Astronomical Observatory of Madrid started in 1876. For ten solar cycles, observations were made in this institution to determine sunspot numbers and areas…
The controversial early brightening in the first half of 20th century: a contribution from pyrheliometer measurements in Madrid (Spain)
M. Antón, J. M. Vaquero, A. J. P. Aparicio
A long-term decrease in downward surface solar radiation from the 1950s to the 1980s ("global dimming") followed by a multi-decadal increase up to the present ("brightening") have…