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Authors: Consolini, G.* 
De Michelis, P.* 
Tozzi, R.* 
Title: On the Earth’s magnetospheric dynamics: Nonequilibrium evolution and the fluctuation theorem
Journal: Journal of Geophysical Research 
Series/Report no.: / 113 (2008)
Publisher: AGU
Issue Date: 21-Aug-2008
DOI: 10.1029/2008JA013074
Keywords: Magnetospheric dynamics
nonequilibrium evolution
fluctuation theorem
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms 
01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics 
01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics 
Abstract: 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.
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