CELLULAR MODEL ANALOGY OF THE MAGNETOSPHERE-IONOSPHERE SUBSTORM ACTIVITY DRIVEN BY SOLAR WIND WITH FINITE VELOCITY OF PENETRATION INTO MAGNETOSPHERE

Abstract

Abstract. The cellular model as an analogy of the dynamical magnetosphere-ionosphere system related with the substorm activity is presented. Each cell in the model contains two connected parts, one of which may be associated with the magnetosphere current sheet piece, and other -with the ionosphere region at the same magnetic field tube. The local positive feedback between magnetospheric and ionospheric parts of each cell has been included in the model. The magnetospheric part of the model system is organised as a rectangular cellular automation with local redistribution of the stored energy from the cells where the threshold value is exceeded. We suppose that the threshold value in each cell depends on external control parameter which influences the long boundaries of the rectangular array. The finite velocity is assumed for the influence penetration into the array and along boundaries. Internal rules in the model are fully deterministic: there is not used any random number. As an external control parameter of the model we consider the z-component of interplanetary magnetic field (B z IMF) which is «freezed» in the solar wind. Dynamics of the model for constant control parameter and for driving by real B z IMF is discussed. The model demonstrates two types of transients. The characteristics of the transients are discussed