Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] History X Earth and Planetary Science

Mon. May 27, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yasuyuki Kano(Earthquake Research Institute, The University of Tokyo), Kei Yoshimura(Institute of Industrial Science, The University of Tokyo), Hiroaki Isobe(Faculty of Fine Arts, Kyoto City University of Arts), kiyomi iwahashi(National Institute of Japanese Literature)

[MIS17-P08] Intense geomagnetic storm during Maunder minimum possibly by quiescent filament eruption

*Hiroaki Isobe1, Yusuke Ebihara2, Harufumi Tamazawa1, Akito Davis Kawamura3, Hisashi Hayakawa4 (1.Faculty of Fine Arts, Kyoto City University of Arts, 2.Research Institute for Sustainable Humanosphere, Kyoto University, 3.Graduate School of Science, Kyoto University, 4.Graduate School of Letters, Osaka University)

Keywords:magnetic storm, aurora, coronal mass ejection, solar flare, Maunder minimum, historical documents

The sun occasionally undergoes the so-called grand minima, in which its magnetic activity, measured by the number of sunspots, is suppressed for decades. The most prominent grand minima, since the beginning of telescopic observations of sunspots, is the Maunder minimum (1645--1715), when the sunspots became rather scarce. The mechanism underlying the grand minima remains poorly understood as there is little observational information of the solar magnetic field at that time. In this study, we examine the records of one candidate aurora display in China and Japan during the Maunder minimum. The presence of auroras in such mid magnetic latitudes indicates the occurrence of great geomagnetic storms that are usually produced by strong solar flares. However, the records of contemporary sunspot observations from Europe suggest that, at least for the likely aurora event, there was no large sunspot that could produce a strong flare. Through simple theoretical arguments, we show that this geomagnetic storm could have been generated by a giant eruption from the spotless sun.