Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51b1398d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM51B-1398
Other
7827 Kinetic And Mhd Theory
Scientific paper
Traditionally, substorm dynamics has being modeled on the assumption of plasma sheet being initially in an equilibrium that gets perturbed, growing into instability. This framework is common to most of the substorm models, whether based on NENL or an internal instability. However, due to intense coupling with the solar wind, it is possible that the magnetosphere is in fact in a metastable, far-from-equilibrium state. There have been detonation models presented in the past, based on this assumption. There are also other models attributing the avalanche character of substorms to self-organized criticality. We present an outline of an alternative substorm model based on an assumption that during substorms, the plasma sheet is a complex system far from equilibrium. The initial assumption is that there is an attractor in a phase space, allowing for a prolonged period of "stable" behaviour even though the system is far from equilibrium. However, once the phase space trajectory is pushed away from the attractor by some dynamical process (change in solar wind conditions, BBF, resonance) the system moves in the direction of energy release, triggering the substorm onset.
Dobias Peter
Wanliss James A.
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