Lengths of Schwabe cycles in the seventh and eighth centuries indicated by precise measurement of carbon-14 content in tree rings
Radiocarbon (14C) is produced in the atmosphere by galactic cosmic rays, which are modulated by solar magnetic activity. Its content in tree rings is retained and provides a record of past cosmic ray intensity and solar activity. We have measured, with 2 year resolution, the 14C content in Japanese...
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| Veröffentlicht in: | Journal of geophysical research. Space physics 2013-12, Vol.118 (12), p.7483-7487 |
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| creator | Miyake, Fusa Masuda, Kimiaki Nakamura, Toshio |
| description | Radiocarbon (14C) is produced in the atmosphere by galactic cosmic rays, which are modulated by solar magnetic activity. Its content in tree rings is retained and provides a record of past cosmic ray intensity and solar activity. We have measured, with 2 year resolution, the 14C content in Japanese cedar tree rings for the period A.D. 600 to 760, which includes a small grand solar minimum in the seventh to eighth centuries. Periodicity analysis of the 14C data shows that there is a component in the frequency band of the Schwabe cycle, with a period of 12–13 years continuing throughout the minimum. This is the fourth case in which an increase in the length of the Schwabe cycle has been observed in a grand solar minimum, after the Maunder Minimum, the Spörer Minimum, and the Fourth Century B.C. Minimum.
Key Points
We measured 14C content in tree-ring from AD600‐760
Increase in the Schwabe cycle length is observed in the 7th century minimum
Fourth case that an increase in the Schwabe cycle length has been observed |
| doi_str_mv | 10.1002/2012JA018320 |
| format | Article |
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Key Points
We measured 14C content in tree-ring from AD600‐760
Increase in the Schwabe cycle length is observed in the 7th century minimum
Fourth case that an increase in the Schwabe cycle length has been observed</description><identifier>ISSN: 2169-9380</identifier><identifier>EISSN: 2169-9402</identifier><identifier>DOI: 10.1002/2012JA018320</identifier><language>eng</language><publisher>Hoboken, NJ: Blackwell Publishing Ltd</publisher><subject>Astronomy ; Astrophysics ; Atmospheres ; Carbon-14 ; Cedar ; Cosmic rays ; cosmogenic nuclide ; Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Frequency bands ; Galactic cosmic rays ; Geophysics ; Interplanetary space ; Physics of the ionosphere ; Physics of the magnetosphere ; Solar activity ; solar cycle ; Solar physics ; Solar system ; Tree rings ; tree-ring</subject><ispartof>Journal of geophysical research. Space physics, 2013-12, Vol.118 (12), p.7483-7487</ispartof><rights>2013. American Geophysical Union. All Rights Reserved.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5075-a2815fb617737b5834527fd566a11a1e9f4f5ec583945e149397279f81f34d9b3</citedby><cites>FETCH-LOGICAL-c5075-a2815fb617737b5834527fd566a11a1e9f4f5ec583945e149397279f81f34d9b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2012JA018320$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2012JA018320$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,27924,27925,45574,45575,46409,46833</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=28145314$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Miyake, Fusa</creatorcontrib><creatorcontrib>Masuda, Kimiaki</creatorcontrib><creatorcontrib>Nakamura, Toshio</creatorcontrib><title>Lengths of Schwabe cycles in the seventh and eighth centuries indicated by precise measurement of carbon-14 content in tree rings</title><title>Journal of geophysical research. Space physics</title><addtitle>J. Geophys. Res. Space Physics</addtitle><description>Radiocarbon (14C) is produced in the atmosphere by galactic cosmic rays, which are modulated by solar magnetic activity. Its content in tree rings is retained and provides a record of past cosmic ray intensity and solar activity. We have measured, with 2 year resolution, the 14C content in Japanese cedar tree rings for the period A.D. 600 to 760, which includes a small grand solar minimum in the seventh to eighth centuries. Periodicity analysis of the 14C data shows that there is a component in the frequency band of the Schwabe cycle, with a period of 12–13 years continuing throughout the minimum. This is the fourth case in which an increase in the length of the Schwabe cycle has been observed in a grand solar minimum, after the Maunder Minimum, the Spörer Minimum, and the Fourth Century B.C. Minimum.
Key Points
We measured 14C content in tree-ring from AD600‐760
Increase in the Schwabe cycle length is observed in the 7th century minimum
Fourth case that an increase in the Schwabe cycle length has been observed</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Atmospheres</subject><subject>Carbon-14</subject><subject>Cedar</subject><subject>Cosmic rays</subject><subject>cosmogenic nuclide</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Frequency bands</subject><subject>Galactic cosmic rays</subject><subject>Geophysics</subject><subject>Interplanetary space</subject><subject>Physics of the ionosphere</subject><subject>Physics of the magnetosphere</subject><subject>Solar activity</subject><subject>solar cycle</subject><subject>Solar physics</subject><subject>Solar system</subject><subject>Tree rings</subject><subject>tree-ring</subject><issn>2169-9380</issn><issn>2169-9402</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqFkUuLFDEUhQtRcBhn5w8IiODC0rxTWTaDtjaNgg96GVKpm66M1ak2qXbspf98UtPjIC40m1xuvnO4ObeqnhL8imBMX1NM6GqBScMoflCdUSJ1rTmmD3_XrMGPq4ucr3A5TWkRcVb9WkPcTn1Go0efXX9tW0Du6AbIKEQ09YAy_IA49cjGDkHY9qV0pXFI4ZbpgrMTdKg9on0CFzKgHdh8SLAr1GzrbGrHWBOO3BinuTk7JwCUQtzmJ9Ujb4cMF3f3efX17Zsvl-_q9cfl-8vFunYCK1Fb2hDhW0mUYqoVDeOCKt8JKS0hloD23Atw5UFzAYRrphVV2jfEM97plp1XL06--zR-P0CezC5kB8NgI4yHbIiSlDBFGfs_yrVsGiEwLuizv9Cr8ZBi-YghkjVlAqlnw5cnyqUx5wTe7FPY2XQ0BJt5e-bP7RX8-Z2pzc4OPtlYgr3XlCS4YIQXjp246zDA8Z-eZrX8tBBYUlFU9UkV8gQ_71U2fTOyZCvM5sPSqA2nm6VaGcFuAPldtNM</recordid><startdate>201312</startdate><enddate>201312</enddate><creator>Miyake, Fusa</creator><creator>Masuda, Kimiaki</creator><creator>Nakamura, Toshio</creator><general>Blackwell Publishing Ltd</general><general>Wiley</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope></search><sort><creationdate>201312</creationdate><title>Lengths of Schwabe cycles in the seventh and eighth centuries indicated by precise measurement of carbon-14 content in tree rings</title><author>Miyake, Fusa ; Masuda, Kimiaki ; Nakamura, Toshio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5075-a2815fb617737b5834527fd566a11a1e9f4f5ec583945e149397279f81f34d9b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Astronomy</topic><topic>Astrophysics</topic><topic>Atmospheres</topic><topic>Carbon-14</topic><topic>Cedar</topic><topic>Cosmic rays</topic><topic>cosmogenic nuclide</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Frequency bands</topic><topic>Galactic cosmic rays</topic><topic>Geophysics</topic><topic>Interplanetary space</topic><topic>Physics of the ionosphere</topic><topic>Physics of the magnetosphere</topic><topic>Solar activity</topic><topic>solar cycle</topic><topic>Solar physics</topic><topic>Solar system</topic><topic>Tree rings</topic><topic>tree-ring</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Miyake, Fusa</creatorcontrib><creatorcontrib>Masuda, Kimiaki</creatorcontrib><creatorcontrib>Nakamura, Toshio</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of geophysical research. Space physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Miyake, Fusa</au><au>Masuda, Kimiaki</au><au>Nakamura, Toshio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Lengths of Schwabe cycles in the seventh and eighth centuries indicated by precise measurement of carbon-14 content in tree rings</atitle><jtitle>Journal of geophysical research. Space physics</jtitle><addtitle>J. Geophys. Res. Space Physics</addtitle><date>2013-12</date><risdate>2013</risdate><volume>118</volume><issue>12</issue><spage>7483</spage><epage>7487</epage><pages>7483-7487</pages><issn>2169-9380</issn><eissn>2169-9402</eissn><abstract>Radiocarbon (14C) is produced in the atmosphere by galactic cosmic rays, which are modulated by solar magnetic activity. Its content in tree rings is retained and provides a record of past cosmic ray intensity and solar activity. We have measured, with 2 year resolution, the 14C content in Japanese cedar tree rings for the period A.D. 600 to 760, which includes a small grand solar minimum in the seventh to eighth centuries. Periodicity analysis of the 14C data shows that there is a component in the frequency band of the Schwabe cycle, with a period of 12–13 years continuing throughout the minimum. This is the fourth case in which an increase in the length of the Schwabe cycle has been observed in a grand solar minimum, after the Maunder Minimum, the Spörer Minimum, and the Fourth Century B.C. Minimum.
Key Points
We measured 14C content in tree-ring from AD600‐760
Increase in the Schwabe cycle length is observed in the 7th century minimum
Fourth case that an increase in the Schwabe cycle length has been observed</abstract><cop>Hoboken, NJ</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2012JA018320</doi><tpages>5</tpages></addata></record> |
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| subjects | Astronomy Astrophysics Atmospheres Carbon-14 Cedar Cosmic rays cosmogenic nuclide Earth, ocean, space Exact sciences and technology External geophysics Frequency bands Galactic cosmic rays Geophysics Interplanetary space Physics of the ionosphere Physics of the magnetosphere Solar activity solar cycle Solar physics Solar system Tree rings tree-ring |
| title | Lengths of Schwabe cycles in the seventh and eighth centuries indicated by precise measurement of carbon-14 content in tree rings |
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