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| Titel |
Conjectured chaotic nature of the ionosphere-magnetosphere coupling in a reconfigurating magnetosphere |
| VerfasserIn |
E. B. Wodnicka |
| 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 ; 3, no. 3 ; Nr. 3, no. 3, S.221-227 |
| Datensatznummer |
250001024
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| Publikation (Nr.) |
 copernicus.org/npg-3-221-1996.pdf |
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| Zusammenfassung |
| During substorms the magnetic field configuration changes in time;
stretching of the magnetosphere during growth phase is followed by its collapse after the
onset of the expansion phase. In this study the ionospheric origin oxygen ion dynamics in
a time-dependent magnetosphere is analyzed. An induction electric field of several mV/m
due to the reconfigurating magnetic field determines the details of the ion extraction
from the auroral topside ionosphere. Two regimes of motion are discernible; a regime in
regions far from the equatorial plane where the magnetic moment is conserved and a regime
near the equatorial plane, in which the motion produces magnetic moment jumps and
oscillations. The time spent by the ion in the regions is determined by the initial
characteristics of the ion and by the field transition features. Lyapunov characteristic
exponents are calculated to estimate the sensitivity of the system to initial conditions.
Their values are higher for orbits with chaotic segments compared with the orbits in the
static magnetic field and depend on the amplitude of the induced electric field. It
follows from the study that the region of chaos usually localized far beyond 10
RE in the
plasma sheet is expected to approach closer to the Earth ( r = 6 - 7 RE) during substorm
associated reconfigurations of the magnetosphere, due to the auroral ionospheric ions. |
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