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| Titel |
The physical basis of ionospheric electrodynamics |
| VerfasserIn |
V. M. Vasyliūnas  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 2 ; Nr. 30, no. 2 (2012-02-13), S.357-369 |
| Datensatznummer |
250017184
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| Publikation (Nr.) |
 copernicus.org/angeo-30-357-2012.pdf |
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| Zusammenfassung |
| The conventional equations of ionospheric electrodynamics, highly succesful
in modeling observed phenomena on sufficiently long time scales, can be
derived rigorously from the complete plasma and Maxwell's equations, provided
that appropriate limits and approximations are assumed. Under the assumption
that a quasi-steady-state equilibrium (neglecting local dynamical terms and
considering only slow time variations of external or aeronomic-process
origin) exists, the conventional equations specify how the various quantities
must be related numerically. Questions about how the quantities are related causally or
how the stress equilibrium is established and on what time scales are not
anwered by the conventional equations but require
the complete plasma and Maxwell's equations, and these lead to a picture of the
underlying physical processes that can be rather different from the commonly
presented intuitive or ad hoc explanations. Particular instances
include the nature of the ionospheric electric current,
the relation between electric field and plasma bulk flow, and the
interrelationships among various quantities of neutral-wind dynamo. |
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