Geomagnetic change during last 100 years

The geomagnetic field is changing with time. The IGRF model has been determined since 1900 every 5 years and it provides 110-year field models. Now we show the change of the magnetic field lines and geomagnetic components observed on the surface of the Earth during 1900 to 2005 in the KML files.

Screenshot: click to zoom up
1900-2005 field
Magnetic field lines and contours of multiple components can be displayed together.

Change of magnetic field lines:

Contour of observable components:

2012/10/03: updated field model (IGRF11th)

References:
International Geomagnetic Reference Field: the eleventh generation, International Association of Geomagnetism and Aeronomy, Working Group V-MOD. Participating members: C. C. Finlay, S. Maus, C. D. Beggan, T. N. Bondar, A. Chambodut, T. A. Chernova, A. Chulliat, V. P. Golovkov, B. Hamilton, M. Hamoudi, R. Holme, G. Hulot, W. Kuang, B. Langlais, V. Lesur, F. J. Lowes, H. Luhr, S. Macmillan, M. Mandea, S. McLean, C. Manoj, M. Menvielle, I. Michaelis, N. Olsen, J. Rauberg, M. Rother, T. J. Sabaka, A. Tangborn, L. Toffner-Clausen, E. Thebault, A. W. P. Thomson, I. Wardinski Z. Wei, T. I. Zvereva., Geophys. J. Int., 183, 1216-1230, 2010. DOI: 10.1111/j.1365-246X.2010.04804.x.
Maus S., Macmillan S., Chernova T., Choi S., Dater D., Golovkov V., Lesur V., Lowes F., Luhr H., Mai W., McLean S., Olsen N., Rother M., Sabaka T., Thomson A., Zvereva T. and International Association of Geomagnetism, Aeronomy (IAGA), Division V, Working Group VMOD, The 10th generation international geomagnetic reference field Phys. Earth Planet. Inter., 151, 320--322, 2005.

Present field << Geomagnetic field past a century >> Geomag past 400yr

Copyright: The MAGE Project Team & Tadahiro Hatakeyama, Information Processing Center, Okayama University of Science, Japan