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| Titel |
An example of resonances, coherent structures and topological phase transitions - the origin of the low frequency broadband spectrum in the auroral zone |
| VerfasserIn |
T. Chang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 8, no. 3 ; Nr. 8, no. 3, S.175-180 |
| Datensatznummer |
250005519
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| Publikation (Nr.) |
 copernicus.org/npg-8-175-2001.pdf |
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| Zusammenfassung |
| We consider the
phenomena of intermittent turbulence in magnetized space plasmas from the
point of view of topological phase transitions involving the merging and
interactions of anisotropic coherent structures. The stochastic behaviour
of these coherent plasma structures can undergo complex changes as the
dynamic system evolves, similar to those commonly observed in (first and
second order) equilibrium phase transitions. When conditions are
favourable, such topological entities can evolve into a state of forced
and/or self-organized criticality (FSOC). As an example, we apply these
ideas to the understanding of the origin of the commonly observed
broadband power-law low frequency electric field spectral densities and
the characteristic filamentary current structures in the auroral zone. The
broadband turbulence can provide efficient resonant energization of the
ionospheric oxygen ions. |
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