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Authors
Otsuka, Yuichi http://orcid.org/0000-0002-3098-3859
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Funding
Funding for this research was provided by:
Japan Society for the Promotion of Science (15H05815, 16H05736)
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Article History
Received: 15 November 2017
Accepted: 29 August 2018
First Online: 20 September 2018
Author’s information
: YO studies the Earth’s ionosphere mainly by using GNSS receivers, radar, and optical instruments.
: The author declares that he has no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
