3 papers
astro-ph.SR2018
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…
astro-ph.SR2016
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…
astro-ph.SR2016
Monitoring the Solar Radius from the Royal Observatory of the Spanish Navy during the Last Quarter-Millennium
J. M. Vaquero, M. C. Gallego, J. J. Ruiz-Lorenzo +5
The solar diameter has been monitored at the Royal Observatory of the Spanish Navy (today the Real Instituto y Observatorio de la Armada: ROA) almost continuously since its creatio…