  We introduce a simple model for Earth's magnetic field reversals. The model
consists in random nodes simulating vortices in the liquid part of the core
which through a simple updating algorithm converge to a self organized critical
state, with inter-reversal time probability distributions functions in the form
of power laws (as supposed to be in actual reversals). It should not be
expected a detailed description of reversals. However, we hope to reach a
profounder knowledge of reversals through some of the basic characteristic that
are well reproduced.
