19 citations · 21 across the 2 of their papers we have counts for
2 papers
astro-ph.SR2026★ 2 cited
Cyclic sunspot activity during the first millennium CE as reconstructed from radiocarbon
Ilya Usoskin, Sami K. Solanki, Natalie A. Krivova +1
Context. Solar activity, dominated by the 11-year cyclic evolution, has been observed directly since 1610. Before that, indirect cosmogenic proxy data are used to reconstruct it ov…
astro-ph.SR2021★ 19 cited
Modeling stellar Ca II H & K emission variations. I. Effect of inclination on the S-index
K. Sowmya, A. I. Shapiro, V. Witzke +5
The emission in the near ultraviolet Ca II H & K lines is modulated by stellar magnetic activity. Although this emission, quantified via the S-index, has been serving as a prime pr…