CALS7K - A time varying field model for 0-7~ka

CALS7K
A time varying paleomagnetic field model for 0-7 ka

This web page is for CALS7K and its relatives. CALS7K is a time varying spherical harmonic model for the geomagnetic field. It is Continuous, constructed from Archeomagnetic (including lavas) and Lake Sediment paleomagnetic data and spans the past 7kyr (5000 BC -1950 AD). Earlier work on the same topic resulted in ALS3K, 100 year snapshot models, and CALS3K both based on a sparse data set and now superseded. The goal is to extend the excellent GUFM1 historical model (Jackson et al., 2000) back in time to study long term secular variation of the geomagnetic field.
Data Sets, Models and Animations:

Data used to construct CALS7K.2

Model Coefficients and Fortran Code for CALS7K.2

Model Coefficients, Code, Snapshots and Animations for CALS7K.2 centered on Pacific

Animations for CALS7K.2 centered on Greenwich

Animations for CALS7K.2 centered on North Pole

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Links to Model Applications:

TransAtlantic tracks of Columbus

Henry Snyder's on-line CALS7K.2 Calculator

Publications:

CALS7K

Korte, M., A. Genevey, C.G. Constable, U. Frank. E. Schnepp (2005) Continuous geomagnetic models for the past 7 millennia I: A new global data compilation. Geochem. Geophys. Geosyst., 6(2), Q02H15 DOI 10.1029/2004GC000800 download pdf
Korte, M., and C.G. Constable (2005) Continuous geomagnetic models for the past 7 millennia II: CALS7K. Geochem. Geophys. Geosyst., 6(2), Q02H16 DOI 10.1029/2004GC000801 download pdf

ALS3K

Johnson, C.L. & C.G. Constable (1998) Persistently anomalous Pacific geomagnetic field. Geophys. Res. Lett., 25, 1011--1014

Constable, C.G., C.L Johnson, and S.P. Lund, (2000), Global geomagnetic field models for the past 3000 years: transient or permanent flux lobes? Phil. Trans. R. Soc. Lond. A, 358, 991-1008.

CALS3K
Korte, M. & C.G. Constable, (2003) Continuous global geomagnetic field models for the past 3000 years, Phys. Earth Planet.Int., 140, 73-89.
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Cathy Constable ( cconstable@ucsd.edu )
Last modified June 29 2005
Back to Cathy Constable's home page

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