  In this work 2D Ising systems were used to simulate the reversals of the
Earth's magnetic field. Each spin was supposed to be a ring current in the
Earth dynamo and the magnetization to be proportional to the field intensity.
Given the relative success of some physical few-discs modeling of this system
all the simulations were implemented in small systems. The temperature T was
used as a tunning parameter. It plays the role of external perturbations. Power
laws were obtained for the distribution of times between reversals. When the
system size was increased the exponent of the power law asymptotically tended
towards values very near -1.5, generally accepted as the right value for this
phenomenon. Depending on the proximity of T and Tc the average duration of
reversal period changes. In this way it is possible to establish a parallel
between the model and more or less well defined periods of the reversal record.
Some possible trends for future works are advanced.
