History of Geo- and Space Sciences
History of Geo- and Space Sciences
History of Geo- and Space Sciences
Articles | Volume 12, issue 2
Articles | Volume 12, issue 2
https://doi.org/10.5194/hgss-12-131-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hgss-12-131-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 12, issue 2
15 Sep 2021
 | 15 Sep 2021

Early history of sudden commencement investigation and some newly discovered historical facts

Yasuharu Sano and Hiroshi Nagano

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Latest update: 03 Jul 2025
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Short summary
This paper studies the early history of geomagnetism (i.e., history before World War II). At that time, the problem of whether the start time of a magnetic storm was simultaneous or not all over the world was discussed. International and domestic research activities of Aikitu Tanakadate, a Japanese geoscientist, were studied by investigating his personal letters concerning with this problem. We will present a hypothesis on the first discoverer of this problem.
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