Reconstruction of the geomagnetic field between 20 and 60 kyr BP from cosmogenic radionuclides in the GRIP ice core

A pure physical model for the simulation of cosmic ray particle interactions with the Earth's atmosphere was used to investigate the effects of a changing geomagnetic field on the production rates of cosmogenic nuclides. Analytical dependencies of the production rates of 3 H, 7 Be, 10 Be, 14 C...

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Bibliographic Details
Published in:Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Main Authors: Wagner, G., Masarik, J., Beer, J., Baumgartner, S., Imboden, D., Kubik, P.W., Synal, H.-A., Suter, M.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2000
Subjects:
10Be and 36Cl production rate
GRIP ice core
paleogeomagnetic field
ice core
Online Access:https://doi.org/10.1016/S0168-583x(00)00285-8
Description
Summary:A pure physical model for the simulation of cosmic ray particle interactions with the Earth's atmosphere was used to investigate the effects of a changing geomagnetic field on the production rates of cosmogenic nuclides. Analytical dependencies of the production rates of 3 H, 7 Be, 10 Be, 14 C and 36 Cl on geomagnetic field intensity were developed. Applying those relations to the 10 Be and 36 Cl fluxes measured in the GRIP ice core, the geomagnetic field intensity for the period between 20 and 60 kyr BP was reconstructed. Comparison with remnant magnetism records from marine sediment cores shows excellent agreement. This validates the use of cosmogenic nuclides in ice cores to reconstruct geomagnetic field variations.

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