448 citations · 2.8k across the 32 of their papers we have counts for
Showing 2016 · astro-ph.SRShow all
2 papers · 2 filters
astro-ph.SR2016★ 20 cited
Dependence of the Sunspot-group Size on the Level of Solar Activity and its Influence on the Calibration of Solar Observers
I. G. Usoskin, G. A. Kovaltsov, T. Chatzistergos
The distribution of the sunspot group size (area) and its dependence on the level of solar activity is studied. It is shown that the fraction of small groups is not constant but de…
astro-ph.SR2016★ 138 cited
Solar activity during the Holocene: the Hallstatt cycle and its consequence for grand minima and maxim
I. G. Usoskin, Y. Gallet, F. Lopes +2
Cosmogenic isotopes provide the only quantitative proxy for analyzing the long-term solar variability over a centennial timescale. While essential progress has been achieved in bot…