Solar-Terrestrial Physics
Space Weather
Environmental History
HAYAKAWA Hisashi
Starting year 2021
Nagoya University
Institute for Advanced Research / Institute for Space–Earth Environmental Research (ISEE)
YLC Designated Assistant Professor
Research Areas：Informatics
Humanities & Social Sciences
Natural Science
Others
Research fields
Research Interests
Solar-Terrestrial Environment
Space Weather
Environmental History
Solar Physics
Geomagnetism
Professional Memberships
Astronomical Society of Japan
Society of Geomagnetism and Earth, Planetary and Space Sciences
Main research topics
The extreme solar storms seriously affect the technological infrastructure of our civilisation. It is known that occurrence of the greatest solar storms in the observational history can be catastrophic to the modern civilisation. Their magnitude has been partially evaluated with the Dst index from 1957 onward. However, historical records and proxy evidence has shown some possible cases with far greater storms than what are known to the modern scientific observations.
This project aims at analysing and quantifying such solar storms using past analog records and historical documents for sunspots, geomagnetism, and auroral visibility, extending their time series to three millennia. This project aims at conducting their case studies to help visualisation of their upper limits, occurrence frequencies, and background mechanism and constrain the existing model studies for the extreme solar storms.
Therefore, this project aims at consulting these analog records and historical documents over the world. This project plans collaborations with specialists in each relevant field beyond the borders and research fields. This collaborative project will allow us to extend the chronology of the solar storms to three millennia, on the basis of original records for such solar storms all over the world.
Geographical distribution of the auroral visibility during the extreme solar storm in September 1859 (Hayakawa et al., 2020, Earth Planets & Space, 72, 122).
Representative papers
Hayakawa, H., Ebihara, Y., Willis, D. M., Toriumi, S., Iju, T., Hattori, K., Wild, M. N., Oliveira, D. M., Ermolli, I., Ribeiro, J. R., Correia, A. P., Ribeiro, A. I., Knipp, D. J. (2019) Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859, Space Weather, 17, 1553– 1569. DOI: 10.1029/2019SW002269.
Hayakawa, H., Mitsuma, Y., Ebihara, Y., Miyake, F. (2019) The Earliest Candidates of Auroral Observations in Assyrian Astrological Reports: Insights on Solar Activity around 660 BCE, The Astrophysical Journal Letters, 884, L18. DOI: 10.3847/2041-8213/ab42e4
Research URL
researchmap https://researchmap.jp/hisashi.hayakawa
Global issues to be solved through this project
Investigations and quantitative reconstructions of the extreme solar storms in the last 3 millennia on the basis of historical archival records
This project aims at investigating and quantifying extreme solar storms over the last three millennia. It is known that solar storms occur more frequently under enhanced solar activity. Among them, the most extreme solar storms occur only infrequently but significantly affect the modern technological infrastructure. Accordingly, these solar storms can be a new natural disaster for the modern civilisation and have required worldwide researches on their understanding, countermeasures, and disaster mitigations. For this global issue, this project aims at extending the scientific chronology to three millennia, using analog records and historical documents for sunspots, aurorae, and geomagnetism. This project also proposes case studies and comprehensive analyses for historical solar storms on the “observational” basis.
Interview
No interview
News
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お知らせ
A paper by T-GEx Fellow Dr. HAYAKAWA Hisashi, Nagoya University, has become the most accessed article in “The Astrophysical Journal Letters” and has been broadcasted in many overseas media outlets.
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お知らせ
T-GEx fellow Dr. HAYAKAWA Hisashi, Nagoya University, submitted a paper to “The Astrophysical Journal” that has had a major impact on the world, with over 80 news articles published overseas.
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お知らせ
T-GEx Fellow Dr. HAYAKAWA Hisashi, Nagoya University, has published a paper in “the Astrophysical Journal Letters”.
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お知らせ
T-GEx Fellow Dr.HATTORI Yuki, Nagoya University, and T-GEx Fellow HAYAKAWA Hisashi, Nagoya University, received “The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology The Young Scientists’ Award”.
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お知らせ
Keitaro Matsumoto, research assistant to T-GEx Fellow Dr.HAYAKAWA Hisashi, Nagoya University, has received the Student Outstanding Presentation Award for his contribution to Dr.Hayakawa’s work on the T-GEx.
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お知らせ
The paper of T-GEx Fellow Dr. HAYAKAWA Hisashi, Nagoya University, was published and reported in the foreign media.
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お知らせ
The paper of T-GEx Fellow Dr. HAYAKAWA Hisashi, Nagoya University, was reported in several overseas media.
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お知らせ
The 2nd Kick-off meeting for AY2022 was held.
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お知らせ
The name was changed to T-GEx Fellow and T-GEx Associate.
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お知らせ
Academic Mentor for FY2021 T-GEx Fellows has been decided.
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お知らせ
T-GEx Fellow Dr. HAYAKAWA Hisashi, Nagoya University, was featured in the media.
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お知らせ
A research group led by Dr. Hisashi Hayakawa (IAR/ISEE, Nagoya University) has been featured in the media for their findings on the appearance of the aurora borealis in Japan 64 years ago.
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お知らせ
Kick-off meeting for AY2021 T-GEx Fellows was held.
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お知らせ
The 8 T-GEx Fellows were selected for AY2021 T-GEx program.