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| Titel |
Daytime F2-layer positive storm effect at middle and lower latitudes |
| VerfasserIn |
A. V. Mikhailov, M. G. Skoblin, M. Forster |
| 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 ; 13, no. 5 ; Nr. 13, no. 5, S.532-540 |
| Datensatznummer |
250011851
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| Publikation (Nr.) |
 copernicus.org/angeo-13-532-1995.pdf |
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| Zusammenfassung |
| Daytime F2-layer positive storm effects at
middle and lower latitudes in the winter thermosphere are analyzed using AE-C,
ESRO-4 neutral gas composition data, ground-based ionosonde observations and
model calculations. Different longitudinal sectors marked by the storm onset as
'night-time' and 'daytime' demonstrate different F2-layer positive storm
mechanisms. Neutral composition changes in the 'night-time' sector with
increased [O] and [N2] absolute concentrations, while (N2/O)storm/(N2/O)quiet\approx1
at F2-layer heights, are shown to contribute largely to the background NmF2
increase at lower latitudes lasting during daytime hours. Storm-induced surges
of the equatorward wind give rise to an additional NmF2
increase above this background level. The mid-latitude F2-layer positive storm
effect in the 'daytime' sector is due to the vertical plasma drift increase,
resulting from the interaction of background (poleward) and storm-induced (equatorward)
thermospheric winds, but not to changes of [O] and [N2]
concentrations. |
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