Phase transition-like behavior of the magnetosphere during substorms
Author
dc.contributor.author
Sitnov, M. I.
Author
dc.contributor.author
Sharma, A. S.
Author
dc.contributor.author
Papadopoulos, K.
Author
dc.contributor.author
Vassiliadis, D.
Author
dc.contributor.author
Valdivia Hepp, Juan
Author
dc.contributor.author
Klimas, A. J.
Author
dc.contributor.author
Baker, D. N.
Admission date
dc.date.accessioned
2018-12-20T14:11:46Z
Available date
dc.date.available
2018-12-20T14:11:46Z
Publication date
dc.date.issued
2000
Cita de ítem
dc.identifier.citation
Journal of Geophysical Research: Space Physics, Volumen 105, Issue A6, 2018, Pages 12955-12974
Identifier
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21699402
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/154635
Abstract
dc.description.abstract
The behavior of substorms as sudden transitions of the magnetosphere is studied using the Bargatze et al. [1985] data set of the solar wind induced electric field vBs and the auroral electrojet index AL. The data set is divided into three subsets representing different levels of activity, and they are studied using the singular spectrum analysis. The points representing the evolution of the magnetosphere in the subspace of the eigenvectors corresponding to the three largest eigenvalues can be approximated by two-dimensional manifolds with a relative deviation of 10-20%. For the first two subsets corresponding to small and medium activity levels the manifolds have a pleated structure typical of the cusp catastrophe. The dynamics of the magnetosphere near these pleated structures resembles the hysteresis phenomenon typical of first-order phase transitions. The reconstructed manifold is similar to the "temperature-pressure-density" diagrams of equilibrium phase transitions. The singular s
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Evidence is presented that suggests that there is a significant self-organized criticality (SOC) component in the dynamics of substorms in the magnetosphere. We assume that observations of bursty bulk flows, fast flows, ...