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| Titel |
A numerical model of the ionosphere, including the E-region above EISCAT |
| VerfasserIn |
P.-Y. Diloy, A. Robineau, J. Lilensten  , P.-L. Blelly, J. Fontanari |
| 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 ; 14, no. 2 ; Nr. 14, no. 2, S.191-200 |
| Datensatznummer |
250012168
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| Publikation (Nr.) |
 copernicus.org/angeo-14-191-1996.pdf |
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| Zusammenfassung |
| It has been previously demonstrated that a
two-ion (O+ and H+) 8-moment time-dependent fluid model
was able to reproduce correctly the ionospheric structure in the altitude range
probed by the EISCAT-VHF radar. In the present study, the model is extended down
to the E-region where molecular ion chemistry (NO+ and O+2,
essentially) prevails over transport; EISCAT-UHF observations confirmed previous
theoretical predictions that during events of intense E×B
induced convection drifts, molecular ions (mainly NO+) predominate
over O+ ions up to altitudes of 300 km. In addition to this extension
of the model down to the E-region, the ionization and heating resulting from
both solar insolation and particle precipitation is now taken into account in a
consistent manner through a complete kinetic transport code. The effects of E×B
induced convection drifts on the E- and F-region are presented: the balance
between O+ and NO+ ions is drastically affected; the
electric field acts to deplete the O+ ion concentration. The [NO+]/[O+]
transition altitude varies from 190 km to 320 km as the perpendicular electric
field increases from 0 to 100 mV m-1. An interesting additional
by-product of the model is that it also predicts the presence of a noticeable
fraction of N+ ions in the topside ionosphere in good agreement with
Retarding Ion Mass Spectrometer measurements onboard Dynamic Explorer. |
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