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Discussion papers | Copyright
https://doi.org/10.5194/npg-2018-42
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Sep 2018

Research article | 28 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).

A comprehensive model for the kyr and Myr time scales of Earth's axial magnetic dipole field

Matthias Morzfeld1 and Bruce A. Buffett2 Matthias Morzfeld and Bruce A. Buffett
  • 1Department of Mathematics, University of Arizona, 617 N. Santa Rita Ave., P.O. Box 210089, Tucson, Arizona 85721, USA
  • 2University of California, Department of Earth & Planetary Science, 307 McCone Hall, Berkeley, CA 94720, USA

Abstract. We consider a stochastic differential equation model for Earth's axial magnetic dipole field. The model's parameters are estimated using diverse and independent data sources that had previously been treated separately. The result is a numerical model that is informed by the full paleomagnetic record on kyr to Myr time scales and whose outputs match data of Earth's dipole in a precisely defined feature-based sense. Specifically, we compute model parameters and associated uncertainties that lead to model outputs that match spectral data of Earth's axial magnetic dipole field but our approach also reveals difficulties with simultaneously matching spectral data and reversal rates. This could be due to model deficiencies or inaccuracies in the limited amount of data. More generally, the approach we describe can be seen as an example of an effective strategy for combining diverse data sets that is particularly useful when the amount of data is limited.

Matthias Morzfeld and Bruce A. Buffett
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Status: open (until 23 Nov 2018)
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Matthias Morzfeld and Bruce A. Buffett
Matthias Morzfeld and Bruce A. Buffett
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Short summary
We discuss how to calibrate simplified models of the geomagnetic dipole field to data collected over the past 2 Myrs over two different time scales.
We discuss how to calibrate simplified models of the geomagnetic dipole field to data collected...
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