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| Titel |
The role of electric field and neutral wind in the generation of polar cap sporadic E |
| VerfasserIn |
T. Nygrén, M. Voiculescu, A. T. Aikio |
| 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 ; 26, no. 12 ; Nr. 26, no. 12 (2008-11-26), S.3757-3763 |
| Datensatznummer |
250016307
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3757-2008.pdf |
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| Zusammenfassung |
| This paper investigates the roles of electric field and neutral wind in the
generation of sporadic-E layers within the polar cap. Two Es layers above
Svalbard, observed by the EISCAT Svalbard Radar (ESR), were chosen for
investigation. The radar experiment contains four beam directions, and this
was used for determining the electric field. The neutral wind was obtained
from the HWM93 model. Formation of Es layers was calculated by integrating
the continuity equation under the action of driving forces due to neutral
wind and electric field. A flat height profile of metal ions was assumed in
the beginning. The calculation gives the time variation of the layer, which
can be compared with observations. In one case the electric field was shown
to be the main driving agent in layer generation. In the other case the
electric field was weak and the layer was produced mainly by the neutral
wind, but the electric field had influence on the height of the layer. A
fairly good agreement between the variations of the observed and calculated
layer altitudes was obtained and some agreement between the intensity
variations was also found. |
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