Author/Authors :
Sorriso-Valvo، نويسنده , , Luca and Stefani، نويسنده , , I.Frank and Carbone، نويسنده , , Vincenzo and Nigro، نويسنده , , Giuseppina and Lepreti، نويسنده , , Fabio Maria Vecchio، نويسنده , , Antonio and Veltri، نويسنده , , Pierluigi، نويسنده ,
Abstract :
We investigate the temporal distribution of polarity reversals of the geomagnetic field. In spite of the common assumption that the reversal sequence can be modeled as a realization of a renewal Poisson process with a variable rate, we show that the polarity reversals strongly depart from a local Poisson statistics. The origin of this failure can be attributed to temporal clustering, thus suggesting the presence of long-range correlations in the underlying dynamo process. In this framework we compare our results with the behaviour of different models that describe the time evolution of the reversals.
