Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.193..197d&link_type=abstract
Earth and Planetary Science Letters, Volume 193, Issue 1-2, p. 197-212.
Physics
45
Scientific paper
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.
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