Influence of secular variation of the geomagnetic field on production rates of in situ produced cosmogenic nuclides

Scaling factors are presented that allow a full description of the cosmic ray flux modulation during secular variation of the geomagnetic field. These scaling factors are analogous to those determined in a similar work [Dunai, T.J., Earth Planet. Sci. Lett. (2000) 176, 157–169] that were accurate fo...

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Bibliographic Details
Published in:Earth and planetary science letters 2001-11, Vol.193 (1), p.197-212
Main Author: Dunai, T.J
Format: Article
Language:English
Subjects:
cosmic rays
cosmogenic elements
exposure age
magnetic field
rates
scale factor
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Summary:Scaling factors are presented that allow a full description of the cosmic ray flux modulation during secular variation of the geomagnetic field. These scaling factors are analogous to those determined in a similar work [Dunai, T.J., Earth Planet. Sci. Lett. (2000) 176, 157–169] that were accurate for field strengths equivalent to present-day field strength, but cannot accommodate field strength variations. Strategies to derive the relevant geomagnetic field parameters are discussed, and are tested with existing production rate calibrations. For 3He a production rate of 103±4 (±2σ) atoms/g olivine/yr (sea level and for zero cutoff rigidity), was derived from calibration sites from Hawaii, Western USA and Canary Islands, covering the time range of 2–281 kyr.
ISSN:0012-821X
1385-013X
DOI:10.1016/S0012-821X(01)00503-9