ON THE QUEST OF THE GEOMAGNETIC REVERSALS TRIGGERS

MAY THE CURRENT DECREASE OF THE GEOMAGNETIC DIPOLE INTENSITY BE AN INDICATOR OF AN IMPENDING POLARITY REVERSAL OF THE EARTH¿S MAGNETIC FIELD? WHAT ARE THE KEYS TO BE EXTRACTED FROM ANCIENT POLARITY REVERSALS AND EXCURSIONS STUDIES? WHAT ARE THE RULINGS CONDITIONS CONTROLLING EARTH¿S MAGNETIC FIELD GEOMETRY UNDER STEADY STATES BETWEEN LOWER MANTLE OR INNER CORE? WHAT ACTUALLY HAPPENS DURING GEOMAGNETIC REVERSALS? DESPITE THE COMPLEX DYNAMIC SITUATION OF THE OUTER CORE, THE OBSERVED GEOMETRIC PATTERN OBSERVED DURING THE LAST POLARITY TRANSITION AND LAST GEOMAGNETIC EXCURSIONS IS SURPRISINGLY SIMPLE. THIS PROJECT AIMS OBTAINING A SIMPLE CONCEPTUAL MODEL THAT REPLICATES THE OBSERVED PATTERN DURING POLARITY TRANSITIONS. IT WILL ALSO TAKE INTO ACCOUNT TOPOGRAPHY, THERMAL AND REOLOGIC CHARACTERISTICS OF THE LOWER MANTLE-OUTER CORE BOUNDARY TOGETHER WITH THE HEMISPHERIC INNER CORE DICHOTOMY. AN INTERDISCIPLINARY TEAM WITH EXPERTS IN GEOMAGNETISM, PHYSICS OF COMPLEX SYSTEMS, ARCHAEOMAGNETISM, GRAVITY, THERMO-MECHANICAL MODELLING, PHASE TRANSITIONS AND EARTH¿S ROTATION HAS BEEN FORMED. OPPOSITE TO THE CLASSICAL APPROACH OF NUMERICAL DYNAMO MODELS THAT REQUIRE LARGE COMPUTATIONAL TIME CONSUMING AND OFTEN USE UNREALISTIC PARAMETERS, WE PROPOSE SIMPLE ASYMMETRIC ISING MODELS. THEY WILL INCLUDE THE LOWER MANTLE-OUTER CORE BOUNDARY (CMB) AND INNER CORE (ICB) GEOMETRIES. BOTH WILL HELP DECIDING WHETHER THE INVERSIONS ARE GOVERNED BY THE INNER TO OUTER OR VICE VERSA MECHANISM. FINALLY, WE WILL USE DIFFERENT ANALYSIS TECHNIQUES FROM OFTEN USED SERIES FROM COMPLEX SYSTEMS IN ORDER TO SURVEY THE SYSTEM¿S ENTROPY AND DETERMINE WHICH PARAMETER MIGHT INDICATE WHETHER WE ARE APPROACHING AN EARTH¿S MAGNETIC FIELD REVERSAL.