98 citations · 899 across the 28 of their papers we have counts for
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astro-ph.SR2021★ 10 cited
A Review for Japanese auroral records on the three extreme space weather events around the International Geophysical Year (1957 -- 1958)
Hisashi Hayakawa, Yusuke Ebihara, Hidetoshi Hata
Solar Cycle 19 was probably the greatest solar cycle over the last four centuries and significantly disrupted the solar-terrestrial environments with a number of solar eruptions an…
astro-ph.SR2021★ 33 cited
Temporal Variations of the Three Geomagnetic Field Components at Colaba Observatory around the Carrington Storm in 1859
Hisashi Hayakawa, Heikki Nevanlinna, Séan P. Blake +3
The Carrington storm in 1859 September has been arguably identified as the greatest geomagnetic storm ever recorded. However, its exact magnitude and chronology remain controversia…