158 citations · 651 across the 25 of their papers we have counts for
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An Optical Atmospheric Phenomenon Observed in 1670 over the City of Astrakhan Was not a Mid-Latitude Aurora
I. G. Usoskin, G. A. Kovaltsov, L. N. Mishina +2
It has been recently claimed (Zolotova and Ponyavin, Solar Phys., 291, 2869, 2016, ZP16 henceforth) that a mid-latitude optical phenomenon, which took place over the city of Astrak…
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…
Revisiting the prediction of solar activity based on the relationship between the solar maximum amplitude and max-max cycle length
V. M. S. Carrasco, J. M. Vaquero, M. C. Gallego
It is very important to forecast the future solar activity due to its effect on our planet and near space. Here, we employ the new version of the sunspot number index (version 2) t…
A Normalized Sunspot-Area Series Starting in 1832: an Update
V. M. S. Carrasco, J. M. Vaquero, M. C. Gallego +1
A new normalized sunspot-area series has been reconstructed from the series obtained by the Royal Greenwich Observatory and other contemporary institutions for the period 1874 - 20…
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…
Sunspot Observations during the Maunder Minimum from the Correspondence of John Flamsteed
V. M. S. Carrasco, J. M. Vaquero
We compile and analyze the sunspot observations made by John Flamsteed for the period 1672-1703, corresponding to the second part of the Maunder Minimum, which appear in the corres…