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| Titel |
The effect of nonlinear ionospheric conductivity enhancement on magnetospheric substorms |
| VerfasserIn |
E. Spencer, S. Patra |
| 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 ; 20, no. 3 ; Nr. 20, no. 3 (2013-06-27), S.429-435 |
| Datensatznummer |
250018980
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| Publikation (Nr.) |
 copernicus.org/npg-20-429-2013.pdf |
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| Zusammenfassung |
| We introduce the effect of enhanced ionospheric conductivity into a
low-order, physics-based nonlinear model of the nightside magnetosphere called WINDMI.
The model uses solar wind and interplanetary magnetic field (IMF) parameters from the ACE satellite located
at the L1 point to predict substorm growth, onset, expansion and recovery
measured by the AL index roughly 50–60 min in advance. The dynamics
introduced by the conductivity enhancement into the model behavior is
described, and illustrated through using synthetically constructed solar wind
parameters as input. We use the new model to analyze two well-documented
isolated substorms: one that occurred on 31 July 1997 from
Aksnes et al. (2002), and another on 13 April 2000 from
Huang et al. (2004). These two substorms have a common feature
in that the solar wind driver sharply decreases in the early part of the
recovery phase, and that neither of them are triggered by northward turning
of the IMF Bz. By controlling the model parameters such that the onset time
of the substorm is closely adhered to, the westward auroral electrojet peaks
during substorm expansion are qualitatively reproduced. Furthermore, the
electrojet recovers more slowly with enhanced conductivity playing a role,
which explains the data more accurately. |
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