HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

The impact of geomagnetic spikes on the production rates of cosmogenic 14 C and 10 Be in the Earth's atmosphere

Abstract : We seek corroborative evidence of the geomagnetic spikes detected in the Near East ca. 980 BC and 890 BC in the records of the past production rates of the cosmogenic nuclides 14 C and 10 Be. Our forward modeling strategy rests on global, time-dependent, geomagnetic spike field models feeding state-of-the-art models of cosmogenic nuclide production. We find that spike models with an energy budget in line with presently inferred large-scale flow at Earth's core surface fail to produce a visible imprint in the nuclide record. Spike models able to reproduce the intensity changes reported in the Near East require an unaccountably high-magnitude core flow, yet their computed impact on cosmogenic isotope production rates remains ambiguous. No simple and unequivocal agreement is obtained between the observed and modeled nuclide records at the epochs of interest. This indicates that cosmogenic nuclides cannot immediately be used to confirm the occurrence of these two geomagnetic spikes.
Document type :
Journal articles
Complete list of metadata

Cited literature [33 references]  Display  Hide  Download

Contributor : Eva Fareau Connect in order to contact the contributor
Submitted on : Tuesday, August 28, 2018 - 9:37:00 AM
Last modification on : Wednesday, October 27, 2021 - 3:57:34 PM
Long-term archiving on: : Thursday, November 29, 2018 - 1:31:58 PM


Publisher files allowed on an open archive




Alexandre Fournier, Yves Gallet, Ilya Usoskin, Philip Livermore, Gennady Kovaltsov. The impact of geomagnetic spikes on the production rates of cosmogenic 14 C and 10 Be in the Earth's atmosphere. Geophysical Research Letters, American Geophysical Union, 2015, 42 (8), pp.2759-2766. ⟨10.1002/2015GL063461⟩. ⟨insu-01862970⟩



Record views


Files downloads