gufm1 historical field model
gufm1 historical field model homepage
Model gufm1 (See Jackson et al.
(2000) - Four centuries of geomagnetic secular variation
from historical records, Phil. Trans. Roy. Soc. A (2000) Vol. 358, pp957-99) provides our most complete picture of the evolution
of the geomagnetic field, both at Earth's surface and at the core surface from
1590 to 1990. Below you can find downlaods of the field model and animations of various
components of the field over this period. It should be noted that since no intensity data is available prior to 1840, the axial dipole
component is linearly extrapolated back before this date.
Downloads of gufm1 field model
- Time-dependent historical model gufm1 1590-1990: gufm1
- Directory of single epoch field models derived from gufm1: single epochs
- README text file giving details of the gufm1 field model and its file format conventions: README
- Fortran code for evaluating gufm1 at a desired time and location: eval_field.f
Animations of gufm1 field evolution
All animations are available in animated .gif files which can be viewed using both netscape and internet explorer, but are slow to
download, as well as quicktime .mov files, though these require a quicktime
viewer. Animations constructed using the analysis of
Finlay and Jackson (Science Volume 300, pp. 2084-2086) are also provided, along with animations of the Bres field used in this study
both at the core surface and at Earth's surface, using more familiar contouring and colour schemes .
Finally there is an animation of the downward continuation of Bz through the mantle to the core surface (in 1980) courtesy of Steve Gibbons.
- Z at the core surface .gif .mov .mpeg and at Earth's surface .gif .mov
- dZ/dt at the core surface .gif .mov and at Earth's surface .gif .mov
- Z (Symmetric part) at the core surface .gif .mov
- Z (Anti-symmetric part) at the core surface .gif .mov
- X at the core surface .gif .mov and at Earth's surface .gif .mov
- Y at the core surface .gif .mov and at Earth's surface .gif .mov
- H at the core surface .gif .mov and at Earth's surface .gif .mov
- F at the core surface .gif .mov and at Earth's surface .gif .mov
- I at the core surface .gif .mov and at Earth's surface .gif .mov
- Ianom at the core surface .gif .mov and at Earth's surface .gif .mov
- D at the core surface .gif .mov and at Earth's surface .gif .mov
- Movie 1 from Finlay and Jackson '03 (B_r at core surface).gif .mov
- Movie 2 from Finlay and Jackson '03 (B_r - time averaged axisymmetric field at core surface).gif .mov
- Movie 3 from Finlay and Jackson '03 (B_r - time averaged axisymmetric field at core surface) HP filtered with Tcut=400yrs.gif .mov
- Bres at the core surface .gif .mov and at Earth's surface .gif .mov
- Downward continuation of Bz from Earth's surface to the core surface .gif .mov
