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Multiradionuclide e...
Multiradionuclide evidence for the solar origin of the cosmic-ray events of ᴀᴅ 774/5 and 993/4.
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- Mekhaldi, Florian (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,Lund Univ, Dept Geol Quaternary Sci, S-22362 Lund, Sweden.
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- Muscheler, Raimund (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,Lund Univ, Dept Geol Quaternary Sci, S-22362 Lund, Sweden.
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- Adolphi, Florian (author)
- Lund University,Lunds universitet,Kvartärgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Quaternary Sciences,Department of Geology,Faculty of Science,Lund Univ, Dept Geol Quaternary Sci, S-22362 Lund, Sweden.
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- Aldahan, Ala (author)
- Uppsala universitet,Luft-, vatten- och landskapslära,United Arab Emirates Univ, Dept Geol, Al Ain 17551, U Arab Emirates.
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- Beer, Jürg (author)
- Swiss Fed Inst Aquat Sci & Technol, CH-8600 Dubendorf, Switzerland.
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- McConnell, Joseph R (author)
- Univ Nevada, Desert Res Inst, Div Hydrol Sci, Reno, NV 89506 USA.
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- Possnert, Göran (author)
- Uppsala Univ, Tandem Lab, S-75120 Uppsala, Sweden.
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- Sigl, Michael (author)
- Univ Nevada, Desert Res Inst, Div Hydrol Sci, Reno, NV 89506 USA.;Paul Scherrer Inst, Lab Radiochem & Environm Chem, CH-5232 Villigen, Switzerland.
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- Svensson, Anders (author)
- Univ Copenhagen, Niels Bohr Inst, Ctr Ice & Climate, DK-2100 Copenhagen, Denmark.
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- Synal, Hans-Arno (author)
- ETH, Lab Ion Beam Phys, CH-8093 Zurich, Switzerland.
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- Welten, Kees C (author)
- Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
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- Woodruff, Thomas E (author)
- Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA.
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(creator_code:org_t)
- 2015-10-26
- 2015
- English.
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 6
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Abstract
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- The origin of two large peaks in the atmospheric radiocarbon ((14)C) concentration at AD 774/5 and 993/4 is still debated. There is consensus, however, that these features can only be explained by an increase in the atmospheric (14)C production rate due to an extraterrestrial event. Here we provide evidence that these peaks were most likely produced by extreme solar events, based on several new annually resolved (10)Be measurements from both Arctic and Antarctic ice cores. Using ice core (36)Cl data in pair with (10)Be, we further show that these solar events were characterized by a very hard energy spectrum with high fluxes of solar protons with energy above 100 MeV. These results imply that the larger of the two events (AD 774/5) was at least five times stronger than any instrumentally recorded solar event. Our findings highlight the importance of studying the possibility of severe solar energetic particle events.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Annan naturvetenskap (hsv//swe)
- NATURAL SCIENCES -- Other Natural Sciences (hsv//eng)
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Mekhaldi, Floria ...
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Muscheler, Raimu ...
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Adolphi, Florian
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Aldahan, Ala
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Beer, Jürg
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McConnell, Josep ...
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show more...
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Possnert, Göran
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Sigl, Michael
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Svensson, Anders
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Synal, Hans-Arno
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Welten, Kees C
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Woodruff, Thomas ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Meteorology and ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Other Natural Sc ...
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Nature Communica ...
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Lund University
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Uppsala University