HR: 0800h
AN: SM51B-0534    [Abstracts]
TI: Relative Order of Auroral Transient Structure During Substorm Activation
AU: Kozelov, B V
EM: Boris.Kozelov@gmail.com
AF: Department of Physics and Technology, University of Tromso, Tromso, 9037, Norway
AU: Kozelov, B V
EM: Boris.Kozelov@gmail.com
AF: Polar Geophysical Institute, Murmansk region, Apatity, 184209, Russian Federation
AU: * Rypdal, K
EM: Kristoffer.Rypdal@phys.uit.no
AF: Department of Physics and Technology, University of Tromso, Tromso, 9037, Norway
AB: Variability of auroral structures is a manifestation of the magnetosphere-ionosphere plasma dynamics. During the last decade the complexity of magnetosphere-ionosphere plasma has been widely discussed in numerous papers. The most popular approaches are based on turbulence or/and self-organized criticality paradigms. However, there is no clear evidence that the dynamics during the discussed events is really organization, and not disorganization. The problem is that the magnetosphere-ionosphere system is an open non-equilibrium system, therefore classical thermodynamics is not directly applicable. Here we use an approach based on the S-theorem by Yu.L. Klimontovich. This approach allows us to compare the ordering which characterize the current (non- equilibrium) state of the system with experimental data. The considered characteristic is an analogy of entropy which has been extended to non- equilibrium states. Television observations of the auroral structure during substorm activation at the Barentsburg observatory (Svalbard) have been used as a data set. Dependence of the ordering on the spatial scale has been analyzed. We found that the ordering of the aurora increases during the substorm development. The same approach has been applied to data sets generated by cellular automata models. Evolution of the systems in time and dependence on external control parameters are compared and discussed. Acknowledgements. This work was supported by grant No 171076/V30 of the Norwegian Research Council and partly by the Division of Physical Sciences of Russian Academy of Science.
DE: 0515 Cellular automata
DE: 0550 Model verification and validation
DE: 2704 Auroral phenomena (2407)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 2788 Magnetic storms and substorms (7954)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting