4799 20200213105149.0 10.1093/mnras/stz3345 DOI SCART-2020-0066 Hayakawa, Hisashi Sunspot observations by Hisako Koyama: 1945-1996 2020 STCE Sun: activity Sunspots Astronomical data bases Telescopes Solar-terrestrial relations Clette, Frédéric Horaguchi, Toshihiro Iju, Tomoya Knipp, Delores J. Liu, Huixin Nakajima, Takashi Monthly Notices of the Royal Astronomical Society 492 2020 3 4513-4527 frederic.clette@observatoire.be https://academic.oup.com/mnras/article/492/3/4513/5681395 https://arxiv.org/abs/1911.12702 published in REFERD