Objectif This project will extend to short palaeomagnetic time scales a stochastic description which has recently been proposed for the present main magnetic field. This will make it possible to study the regime (defined by an average state and fluctuations) of the palaeomagnetic field of the last 100,000 years, to test whether it has remained stationary during the whole period (corresponding to the present period of normal polarity), and to see how it corresponds to the regime of the historical magnetic field.In general terms, the project is a comprehensive attempt to combine three different data sets (historical, archeomagnetic and palaeomagnetic data) traditionally considered, analysed and interpreted in rather independent terms. It aims to characterise the general behaviour of the Earth's main magnetic field on a large spectrum of time scales (from secular to short palaeomagnetic time scale) and will bring important constraints for the theory of the origin of this magnetic field.The project will heavily rely on the realisation of a computer programme designed to simulate the magnetic field along the line of the proposed stochastic model. Thus, in order to carry out the study, specific knowledge in geomagnetism, stochastic processes and computer sciences will be required.The results are expected on three different levels: a number of software programmes will be produced: a programme devoted to defining the best stochastic parameters from an archeomagnetic data base, such as the one made available; a flexible and ready for use programme producing a synthetic magnetic field that conforms to the stochastic description according to various physical assumptions, defined by parameters entered in the programme; additional programmes testing the compatibility of the various, depending on the parameters entered, synthetic series produced by the previous programme with real palaeomagnetic data; two databases will be constructed useful for any further investigation: an archeomagnetic database; a data base of palaeomagnetic excursions which, in addition, can possibly be sorted out into several sub-databases depending on their likely origin, inversion or secular variation related; and answers which are as clear as possible to the questions defining the objectives of this research project and regarding the characterisation of the present regime of the geodynamo, the stability of such inter-inversions regimes, and the nature of observed geomagnetic excursions. Programme(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Thème(s) 51 - Evolutionary, Exploratory and General Geology Appel à propositions Data not available Régime de financement Data not available Coordinateur Institut de Physique du Globe de Paris Contribution de l’UE Aucune donnée Adresse Place Jussieu 4 75252 Paris France Voir sur la carte Coût total Aucune donnée Participants (2) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire International Institute of Earthquake Russie Contribution de l’UE Aucune donnée Adresse 113556 Moscow Voir sur la carte Coût total Aucune donnée Universidade de Lisboa Portugal Contribution de l’UE Aucune donnée Adresse 1200 Lisboa Voir sur la carte Coût total Aucune donnée
