Physics – Geophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11308222c&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A8, CiteID A08222
Physics
Geophysics
3
Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Mathematical Geophysics: Stochastic Processes (3235, 4468, 4475, 7857), Magnetospheric Physics: Ring Current, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Nonlinear Geophysics: Complex Systems
Scientific paper
The Earth's magnetosphere evolves as an out-of-equilibrium system due to the continuous coupling with the solar wind and the Earth's ionosphere. We test the validity of the symmetries implied in the Fluctuation Theorem for the magnetospheric dynamics by investigating the long-term evolution of the Earth's magnetospheric ring current, as monitored by the geomagnetic Dst index. We find that the symmetries implied by the Fluctuation Theorem are all verified, thus providing a proof of the existence of a steady state far from equilibrium for the Earth's magnetosphere. A possible link between the Dst index and the entropy production rate is also proposed and discussed.
Consolini Giuseppe
de Michelis Paola
Tozzi Roberta
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