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

Authors
Citation
Tj. Dunai, Influence of secular variation of the geomagnetic field on production rates of in situ produced cosmogenic nuclides, EARTH PLAN, 193(1-2), 2001, pp. 197-212
Citations number
51
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
EARTH AND PLANETARY SCIENCE LETTERS
ISSN journal
0012-821X → ACNP
Volume
193
Issue
1-2
Year of publication
2001
Pages
197 - 212
Database
ISI
SICI code
0012-821X(20011130)193:1-2<197:IOSVOT>2.0.ZU;2-L
Abstract
Scaling factors are presented that allow a full description of the cosmic r ay 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 f or Field strengths equivalent to present-day field strength, but cannot acc ommodate field strength variations. Strategies to derive the relevant geoma gnetic field parameters are discussed. and are tested with existing product ion rate calibrations. For He-3 a production rate of 103 +/- 4 ( +/-2 sigma ) atoms/g olivine/yr (sea level and for zero cutoff rigidity), was derived from calibration sites from Hawaii, Western USA and Canary Islands, coverin g the time range of 2-281 kyr. (C) 2001 Elsevier Science B.V. All rights re served.