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| Titel |
The role of total wind in the vertical dynamics of ions in the E-region at high latitudes |
| VerfasserIn |
M. Voiculescu, M. Ignat |
| 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 ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1191-1197 |
| Datensatznummer |
250015215
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1191-2005.pdf |
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| Zusammenfassung |
| A seasonally dependent total neutral wind model obtained from experimental
data is used to evaluate the diurnal variation of the vertical ion velocity in
the E-region at a high-latitude location (Tromsø), for each season, in the
presence of an electric field with a typical diurnal variation for quiet
auroral days. The diurnal variation and spatial locations of the vertical
convergence of ions are analyzed and the effect of the total wind on the
occurrence of sporadic E-layers is inferred. The results show that the
structure of the wind is an important factor in controlling the vertical
velocities of ions, favoring or hindering the sporadic E-layer formation.
The ion convergence conditions are improved when the permanent wind is
removed, which suggests that sporadic E-layers occur when the mean wind has
small values, thus allowing the electric field and/or the semidiurnal tide
to control the ion dynamics. We conclude that for quiet days the formation
of the sporadic layers is initiated by the electric field, while their
evolution and dynamics is controlled by the wind. We also find that the
seasonal variation of the Es layers cannot be related to the seasonally
dependent wind shear. Although we focus on sporadic E-layers, our results
can be used in the analysis of other processes involving the vertical
dynamics of ions in the E-region at high latitudes. |
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