697 citations · 1.6k across the 26 of their papers we have counts for
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astro-ph.SR2014★ 697 cited
Revisiting the Sunspot Number
Frédéric Clette, Leif Svalgaard, José M. Vaquero +1
Our knowledge of the long-term evolution of solar activity and of its primary modulation, the 11-year cycle, largely depends on a single direct observational record: the visual sun…
astro-ph.SR2014★ 27 cited
Errors in Scale Values for Magnetic Elements for Helsinki
Leif Svalgaard
Using several lines of evidence we show that the scale values of the geomagnetic variometers operating in Helsinki in the 19th century were not constant throughout the years of ope…