Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC)

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Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC). / O’Hare, Paschal; Mekhaldi, Florian; Adolphi, Florian; Raisbeck, Grant; Aldahan, Ala; Anderberg, Emma; Beer, Jürg; Christl, Marcus; Fahrni, Simon; Synal, Hans Arno; Park, Junghun; Possnert, Göran; Southon, John; Bard, Edouard; Muscheler, Raimund.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 116, No. 13, 2019, p. 5961-5966.

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O’Hare, Paschal ; Mekhaldi, Florian ; Adolphi, Florian ; Raisbeck, Grant ; Aldahan, Ala ; Anderberg, Emma ; Beer, Jürg ; Christl, Marcus ; Fahrni, Simon ; Synal, Hans Arno ; Park, Junghun ; Possnert, Göran ; Southon, John ; Bard, Edouard ; Muscheler, Raimund. / Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC). In: Proceedings of the National Academy of Sciences of the United States of America. 2019 ; Vol. 116, No. 13. pp. 5961-5966.

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TY - JOUR

T1 - Multiradionuclide evidence for an extreme solar proton event around 2,610 B.P. (∼660 BC)

AU - O’Hare, Paschal

AU - Mekhaldi, Florian

AU - Adolphi, Florian

AU - Raisbeck, Grant

AU - Aldahan, Ala

AU - Anderberg, Emma

AU - Beer, Jürg

AU - Christl, Marcus

AU - Fahrni, Simon

AU - Synal, Hans Arno

AU - Park, Junghun

AU - Possnert, Göran

AU - Southon, John

AU - Bard, Edouard

AU - Muscheler, Raimund

PY - 2019

Y1 - 2019

N2 - Recently, it has been confirmed that extreme solar proton events can lead to significantly increased atmospheric production rates of cosmogenic radionuclides. Evidence of such events is recorded in annually resolved natural archives, such as tree rings [carbon-14 ( 14 C)] and ice cores [beryllium-10 ( 10 Be), chlorine-36 ( 36 Cl)]. Here, we show evidence for an extreme solar event around 2,610 years B.P. (∼660 BC) based on high-resolution 10 Be data from two Greenland ice cores. Our conclusions are supported by modeled 14 C production rates for the same period. Using existing 36 Cl ice core data in conjunction with 10 Be, we further show that this solar event was characterized by a very hard energy spectrum. These results indicate that the 2,610-years B.P. event was an order of magnitude stronger than any solar event recorded during the instrumental period and comparable with the solar proton event of AD 774/ 775, the largest solar event known to date. The results illustrate the importance of multiple ice core radionuclide measurements for the reliable identification of short-term production rate increases and the assessment of their origins.

AB - Recently, it has been confirmed that extreme solar proton events can lead to significantly increased atmospheric production rates of cosmogenic radionuclides. Evidence of such events is recorded in annually resolved natural archives, such as tree rings [carbon-14 ( 14 C)] and ice cores [beryllium-10 ( 10 Be), chlorine-36 ( 36 Cl)]. Here, we show evidence for an extreme solar event around 2,610 years B.P. (∼660 BC) based on high-resolution 10 Be data from two Greenland ice cores. Our conclusions are supported by modeled 14 C production rates for the same period. Using existing 36 Cl ice core data in conjunction with 10 Be, we further show that this solar event was characterized by a very hard energy spectrum. These results indicate that the 2,610-years B.P. event was an order of magnitude stronger than any solar event recorded during the instrumental period and comparable with the solar proton event of AD 774/ 775, the largest solar event known to date. The results illustrate the importance of multiple ice core radionuclide measurements for the reliable identification of short-term production rate increases and the assessment of their origins.

KW - Ice cores

KW - Radionuclides

KW - Solar proton events

KW - Solar storms

U2 - 10.1073/pnas.1815725116

DO - 10.1073/pnas.1815725116

M3 - Article

VL - 116

SP - 5961

EP - 5966

JO - Proceedings of the National Academy of Sciences

T2 - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

SN - 1091-6490

IS - 13

ER -