HR: 08:20h
AN: NG31C-02    [Abstracts]
TI: Robustness and scaling: Key Observables in the Complex Dynamic Magnetosphere
AU: * Chapman, S C
EM: sandrac@astro.warwick.ac.uk
AF: Space and Astrophysics, University of Warwick, Coventry, CV4 7AL United Kingdom
AU: Watkins, N W
EM: nww@bas.ac.uk
AF: Physical Sciences Division, British Antarctic Survey, Cambridge, CB3 0ET United Kingdom
AU: Dendy, R O
EM: R.O.Dendy@ukaea.org.uk
AF: Euratom/UKAEA Fusion, Culham, Oxon, OX14 3DB United Kingdom
AB: Plasma transport and energy dissipation in the driven dynamic magnetosphere are intermittent (bursty), and occur on a range of spatiotemporal scales. System observables such as geomagnetic indices, and auroral images, show evidence of scaling in the statistics of these events. Taken together these are hallmarks of a complex system. Here we compare two simple models- that of a system in an SOC state, and the Edwards Wilkinson (EW) model for interface growth, to underline the importance of robustness in these statistical signatures with respect to variability in the drive, and of bursty transport as opposed to intermittent structures, as key signatures of nonlinear complex avalanching systems. Power law statistics of bursty events do not necessarily require an underlying nonlinearity.
DE: 2407 Auroral ionosphere (2704)
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
DE: 3250 Fractals and multifractals
SC: Nonlinear Geophysics [NG]
MN: 2004 AGU Fall Meeting