697 citations · 1.2k across the 14 of their papers we have counts for
Showing 2019Show all
2 papers · 1 filter
astro-ph.SR2019★ 15 cited
Sunspot Observations by Hisako Koyama: 1945-1996
Hisashi Hayakawa, Frédéric Clette, Toshihiro Horaguchi +4
The sunspot record is the only observational tracer of solar activity that provides a fundamental, multi-century reference. Its homogeneity has been largely maintained with a succe…
astro-ph.IM2019★ 4 cited
Historical astronomical data: urgent need for preservation, digitization enabling scientific exploration
Alexei Pevtsov, Elizabeth Griffin, Jonathan Grindlay +16
Over the past decades and even centuries, the astronomical community has accumulated a signif-icant heritage of recorded observations of a great many astronomical objects. Those re…