| Temporal and spatial evolutions of a large sunspot group and great auroral storms around the Carrington event in 1859 H Hayakawa, Y Ebihara, DM Willis, S Toriumi, T Iju, K Hattori, MN Wild, ... Space Weather 17 (11), 1553-1569, 2019 | 88 | 2019 |
| Intensity and impact of the New York Railroad superstorm of May 1921 JJ Love, H Hayakawa, EW Cliver Space Weather 17 (8), 1281-1292, 2019 | 87 | 2019 |
| Long-lasting extreme magnetic storm activities in 1770 found in historical documents H Hayakawa, K Iwahashi, Y Ebihara, H Tamazawa, K Shibata, DJ Knipp, ... The Astrophysical Journal Letters 850 (2), L31, 2017 | 73 | 2017 |
| Lifetimes and emergence/decay rates of star spots on solar-type stars estimated by Kepler data in comparison with those of sunspots K Namekata, H Maehara, Y Notsu, S Toriumi, H Hayakawa, K Ikuta, ... The Astrophysical Journal 871 (2), 187, 2019 | 70 | 2019 |
| The great space weather event during 1872 February recorded in East Asia H Hayakawa, Y Ebihara, DM Willis, K Hattori, AS Giunta, MN Wild, ... The Astrophysical Journal 862 (1), 15, 2018 | 64 | 2018 |
| Low-latitude aurorae during the extreme space weather events in 1859 H Hayakawa, Y Ebihara, DP Hand, S Hayakawa, S Kumar, S Mukherjee, ... The Astrophysical Journal 869 (1), 57, 2018 | 63 | 2018 |
| East Asian observations of low-latitude aurora during the Carrington magnetic storm H Hayakawa, K Iwahashi, H Tamazawa, H Isobe, R Kataoka, Y Ebihara, ... Publications of the Astronomical Society of Japan, psw097, 2016 | 60 | 2016 |
| Records of sunspot and aurora during CE 960–1279 in the Chinese chronicle of the Sòng dynasty H Hayakawa, H Tamazawa, AD Kawamura, H Isobe Earth, Planets and Space 67, 1-14, 2015 | 54 | 2015 |
| Recalibration of the sunspot-number: status report F Clette, L Lefèvre, T Chatzistergos, H Hayakawa, VMS Carrasco, R Arlt, ... Solar Physics 298 (3), 44, 2023 | 52 | 2023 |
| The earliest drawings of datable auroras and a two-tail comet from the Syriac Chronicle of Zūqnīn H Hayakawa, Y Mitsuma, Y Fujiwara, AD Kawamura, R Kataoka, ... Publications of the Astronomical Society of Japan 69 (2), 17, 2017 | 51 | 2017 |
| The extreme space weather event in September 1909 H Hayakawa, Y Ebihara, EW Cliver, K Hattori, S Toriumi, JJ Love, ... Monthly Notices of the Royal Astronomical Society 484 (3), 4083-4099, 2019 | 50 | 2019 |
| Possible cause of extremely bright aurora witnessed in East Asia on 17 September 1770 Y Ebihara, H Hayakawa, K Iwahashi, H Tamazawa, AD Kawamura, ... Space Weather 15 (10), 1373-1382, 2017 | 49 | 2017 |
| The extreme space weather event in 1903 October/November: An outburst from the quiet Sun H Hayakawa, P Ribeiro, JM Vaquero, MC Gallego, DJ Knipp, F Mekhaldi, ... The Astrophysical Journal Letters 897 (1), L10, 2020 | 47 | 2020 |
| Thaddäus Derfflinger’s sunspot observations during 1802–1824: a primary reference to understand the Dalton Minimum H Hayakawa, BP Besser, T Iju, R Arlt, S Uneme, S Imada, PA Bourdin, ... The Astrophysical Journal 890 (2), 98, 2020 | 45 | 2020 |
| Records of sunspots and aurora candidates in the Chinese official histories of the Yuán and Míng dynasties during 1261–1644 H Hayakawa, H Tamazawa, Y Ebihara, H Miyahara, AD Kawamura, ... Publications of the Astronomical Society of Japan 69 (4), 65, 2017 | 45 | 2017 |
| On the intensity of the magnetic superstorm of September 1909 JJ Love, H Hayakawa, EW Cliver Space Weather 17 (1), 37-45, 2019 | 44 | 2019 |
| Historical auroras in the 990s: evidence of great magnetic storms H Hayakawa, H Tamazawa, Y Uchiyama, Y Ebihara, H Miyahara, ... Solar Physics 292, 1-14, 2017 | 41 | 2017 |
| On the size of the flare associated with the solar proton event in 774 AD EW Cliver, H Hayakawa, JJ Love, DF Neidig The Astrophysical Journal 903 (1), 41, 2020 | 35 | 2020 |
| A great space weather event in February 1730 H Hayakawa, Y Ebihara, JM Vaquero, K Hattori, VMS Carrasco, ... Astronomy & Astrophysics 616, A177, 2018 | 35 | 2018 |
| Earliest datable records of aurora-like phenomena in the astronomical diaries from Babylonia H Hayakawa, Y Mitsuma, Y Ebihara, AD Kawamura, H Miyahara, ... Earth, Planets and Space 68, 1-9, 2016 | 34 | 2016 |
