研究者詳細 - 川本　悠紀子

論文 - 川本　悠紀子

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Digitization of weather records of Seungjeongwon Ilgi: A historical weather dynamics dataset of the Korean Peninsula in 1623–1910 査読有り

Lyu Z., Ichikawa K., Cheng Y., Hayakawa H., Kawamoto Y.

Geoscience Data Journal 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Geoscience Data Journal

Historical weather records from Europe indicate that the Earth experienced substantial climate variability, which caused, for instance, the Little Ice Age and the global crisis in the period between the 14th and 19th centuries. However, it is still unclear how global this climate variability was because of the scarce meteorological data availability in other regions including East Asia, especially around the 17th century. In this context, Seungjeongwon Ilgi, a daily record of the Royal Secretariat of the Joseon Dynasty of Korea, is a precious source of historical meteorological records for the Korean Peninsula, as it covers 288 years of weather observations made during 1623–1910. We used the digital database of Seungjeongwon Ilgi to construct a machine-readable weather condition dataset. To this end, we extracted valid weather information from the original weather description text and compiled them into pre-defined weather categories. Additionally, we attempted to improve the usability of dataset by converting the reported dates in the traditional calendar system to those in the Gregorian calendar. Finally, we outlined promising implications of this dataset for meteorological and climatological studies, while describing the limitations of the dataset. Overall, future studies focusing on the climate and weather of the past could use this meteorological database for investigating long-term climate variability. Our datasets are publicly available at 10.5281/zenodo.8382243.

DOI： 10.1002/gdj3.227

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Cometary records revise Eastern Mediterranean chronology around 1240 CE

Koji Murata, Kohei Ichikawa, Yuri I Fujii, Hisashi Hayakawa, Yongchao Cheng, Yukiko Kawamoto, Hidetoshi Sano

Publications of the Astronomical Society of Japan 2021年2月

Three case reports on the cometary plasma tail in the historical documents 査読有り

Hisashi Hayakawa, Yuri I. Fujii, Koji Murata, Yasuyuki Mitsuma, Yongchao Cheng, Nagatoshi Nogami, Kohei Ichikawa, Hidetoshi Sano, Kohji Tsumura, Yukiko Kawamoto, Masaki N. Nishino

Journal of Space Weather and Space Climate 11 巻頁： 21 - 21 2021年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Space Weather and Space Climate

Cometary tails visually manifest the solar wind and became an initial hint for its discovery. While the solar wind is being directly monitored with satellites, its time series before the space age has been controversially reconstructed with multiple proxies. Recently, archival reports of cometary plasma tails have been subjected to consideration to indirectly measure the solar wind but brought conclusion that no plasma tails had been reported prior to 1769 probably due to their brightness. However, historical records have occasionally reported comets with two tails even before 1769. These cases have been tentatively associated with visual reports of cometary plasma and dust tails. Therefore, we examined three such cases (C/1577 V1, 1P/837, and 1P/760), and compared the descriptions in historical records with calculated direction of their plasma tails. Our comparisons show that the records and calculations agree in these cases and plasma tails were visually recorded corresponding to these three great comets. These cases certify the capability of plasma tail observations with the unaided eye even before 1769, qualitatively imply their extreme brightness, proximities with the Sun and the Earth, relative enhancements of UV radiations, and interaction of cometary neutral atmosphere with solar wind plasma and magnetic field, while the lack of their detailed length or kink hinders us from their quantitative measuring. Further investigations will likely lead to the re-discovery of even more visual evidence of cometary plasma tails and, hence, improve our understanding on past space climate.

DOI： 10.1051/swsc/2020045

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Peristyles in Greek World 査読有り

Yukiko Kawamoto

頁： 709-710 2016年8月

ウィトルウィウス『建築書』第六書第五章を読み直す査読有り

川本悠紀子

日本建築学会学術講演梗概集頁： 739-740 2013年8月

古代におけるアプシスとエクセドラについて査読有り

川本悠紀子

日本建築学会学術講演梗概集. F-2, 建築歴史・意匠頁： 679-680 2011年7月

古代ローマ住宅における饗応空間 : メナンドロスの家と饗宴空間を表現する言葉査読有り

川本悠紀子

日本建築学会学術講演梗概集. F-2, 建築歴史・意匠頁： 149-150 2010年7月

イタリアの古代都市における都市の発展と再生に関する研究

川本悠紀子

東京大学グローバルCOEプログラム　「都市空間の持続再生学の展開」　2009年度年次報告書頁： 560-563 2010年2月

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