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A Study of Variation of the 11-yr Solar Cycle before the onset of the Spoerer Minimum based on Annually measured 14C Content in tree Rings

Published online by Cambridge University Press:  22 November 2019

Toru Moriya ,
Hiroko Miyahara ,
Motonari Ohyama ,
Masataka Hakozaki ,
Mirei Takeyama ,
Hirohisa Sakurai  and
Fuyuki Tokanai
Toru Moriya*
Affiliation:
Center for Accelerator Mass Spectrometry, Yamagata University, Yamagata999-3101, Japan
Hiroko Miyahara
Affiliation:
Humanities and Sciences/Museum Carriers, Musashino Art University, Tokyo 187-8505, Japan
Motonari Ohyama
Affiliation:
Botanical Gardens, Tohoku University, Miyagi 980-0862, Japan
Masataka Hakozaki
Affiliation:
National Museum of Japanese History, Chiba 285-8502, Japan
Mirei Takeyama
Affiliation:
Center for Accelerator Mass Spectrometry, Yamagata University, Yamagata999-3101, Japan
Hirohisa Sakurai
Affiliation:
Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
Fuyuki Tokanai
Affiliation:
Center for Accelerator Mass Spectrometry, Yamagata University, Yamagata999-3101, Japan Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
*
*Corresponding author. Email: [email protected]
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Abstract

Proxy-based observations of solar activity in the past have revealed long-term variations, such as the Gleissberg cycle (~88 yr), de Vries cycle (~200 yr), and the Hallstatt cycle (~2000 yr). Such long-term variations of solar activity sometimes cause the disappearance of sunspots for several decades. Currently, solar activity is becoming weaker, and there is a possibility that another long-term sunspot minimum could occur. However, the detailed mechanism of the weakening in solar activity is unknown, and the prediction of solar activity is ambiguous. In this study, we investigate the transitions of solar cycle length before the onset of the Spoerer Minimum, the longest grand minimum in the past 2000 yr. We measured the 14C content in an asunaro tree (Thujopsis dolabrata) excavated at Shimokita Peninsula from 1368–1420 CE using the compact AMS system at Yamagata University. It is found that the solar cycle lengthened to be 14–16 yr from 2 cycles before the onset of the Spoerer Minimum.

Keywords

11-yr solar cycleSpoerer MinimumYU-AMS
Type
Conference Paper
Information
Radiocarbon , Volume 61 , Issue 6: Radiocarbon 2018 Conference Proceedings Trondheim, Norway, June 17–22, 2018 Part 2 of 2 , December 2019 , pp. 1749 - 1754
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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Footnotes

Selected Papers from the 23rd International Radiocarbon Conference, Trondheim, Norway, 17–22 June, 2018

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