Chaos and ergodicity of the recent geomagnetic field with implications for frequent repeat station surveys

Paper type: 
Oral presentation

The present geomagnetic field is chaotic, i.e. after around 6 years cannot be longer predicted, and ergodic, i.e. time averages correspond to phase space averages. These properties are deduced from complex analyses of Observatory time series in a reconstructed phase space or of global predicted and definitive models differences in the time domain. These results imply that there is a strong need to make repeat station magnetic surveys more frequently than every 5 years. This, in turn, will also improve the geomagnetic field secular variation models.

Ergodicity_geomagnetic_field_MAgnetE.doc37 KB