Abstract:

 It is generally acknowledged that geomagnetic polarity has reversed many times in geological history. However, the causes have been unknown up to now. The fractal and chaos theories have been applied to analyzing the phenomenon in geomagnetic polarity reversal. The temporal intervals of geomagnetic polarity reversal have the characters of fractal. The system of earth magnetic field maintains a sort of temporal or spatial order structure by exchanging substance and energy with outside continuously. Random of reversal geomagnetic polarity has the selfreversion characteristic of chaos and chaos theory gives a simple and clear explanation for the dynamic cause of geomagnetic polarity reversal.

Key words: Key words: geomagnetic polarity reversal; fractal; chaos; fractal dimension; nonlinearity