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| Titel |
On the possibility of ion-drag to induce dynamic instability in the lower thermosphere neutral gas |
| VerfasserIn |
C. M. Hall |
| 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 ; 18, no. 8 ; Nr. 18, no. 8, S.967-971 |
| Datensatznummer |
250014046
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| Publikation (Nr.) |
 copernicus.org/angeo-18-967-2000.pdf |
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| Zusammenfassung |
Strong wind shears may result in dynamic
instability, often characterised by the Richardson number lying between zero and
0.25. The extent to which electric-field driven ion flow may induce such neutral
wind shears is examined. Further, it is proposed that, in the ionosphere, it is
possible for electric fields to drive ion winds such that the collisionally
induced neutral air response may be comparable to viscous damping of neutral
motion. We shall present an analogy to the Reynolds Number Re to quantify
this effect. In the same way that Re may be used to evaluate the
likelihood of a flow being turbulent, the analagous metric may also indicate
where in the atmosphere plasma dynamics may be strong enough to destabilise the
neutral dynamics.
Key words: Ionosphere (auroral ionosphere;
ionosphere-atmosphere interactions) - Meteorology and atmospheric dynamics
(turbulence) |
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