Can the Auroral Kilometric Radiation be a Self-Organized Criticality System?

We present statistical results for the analysis of 240 Auroral Kilometric Radiation (AKR) dynamical spectra containing 3,750 short-time AKR bursts each, and recorded on-board Interball-2 mission (POLRAD and MEMO experiments). Data were collected between December 1996 and February 1998. We found that frequency distribution of short AKR bursts as a function of their Power Spectral Density, shows for intense bursts a powerlaw fall. This is the hallmark of the Self-Organized Criticality (SOC) systems. In our case a simple analytical Logistic Growth SOC model can reproduce increments of Electron Cyclotron Maser instability expected for AKR.