EarthRef.org Digital Archive (ERDA) -- CALS7K.2 model coefficients and code

Description
We present a continuous global geomagnetic field models for the recent millennia: CALS7K.2 covering 7000 years from 5000~BC to 1950~AD. The model was determined by regularized least squares inversion of archeo- and paleomagnetic data using spherical harmonics in space and cubic B-splines in time. While data accuracy and dating uncertainties remain limited, reliable low-resolution global models can be obtained. For the first time a significant amount of archeointensity data is used in this kind of global model, allowing the determination of evolution of the dipole strength. For faster download, this archive contains only the CALS7K.1 coefficients and FORTRAN code to evaluate them.

Instructions
File CALS7K_2a.zip contains model coefficients file CALS7K.2 and FORTRAN example programs to evaluate them. Details about the programs are given in the files.