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| Titel |
Upper thermospheric ion-neutral coupling from combined optical and radar experiments over Svalbard |
| VerfasserIn |
E. M. Griffin, A. L. Aruliah, I. McWhirter, H.-C. I. Yiu, A. Charalambous |
| 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 ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-26), S.4293-4303 |
| Datensatznummer |
250016711
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4293-2009.pdf |
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| Zusammenfassung |
| The response of thermospheric neutral parameters such as winds and
temperatures to rapid changes in geophysical conditions has usually been
considered to be relatively slow, on the order of hours, and steady,
representing an integration of more rapid ionospheric changes. Quantifying
the relevant ion-neutral coupling has proved difficult due to a lack of
relevant laboratory data for the most important collisions, namely between
neutral atomic oxygen and its first ion. As a result the representation of
ion-neutral coupling in numerical models of the upper atmosphere has often
produced poor comparison to experimental data. Using a unique combination of
spatially extended ion and neutral thermospheric parameters we show that the
neutral response can be very rapid, within 15 min, to imposed forcing
via ion-neutral coupling. The array of complementary instrumentation
measuring the thermosphere above Svalbard in the Northern Hemisphere allows
detailed study of the causes and effects from both the ion and neutral
perspectives. The implications for development and testing of the
thermospheric numerical models is discussed. |
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