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| Titel |
Initial daytime and nighttime SOFDI observations of thermospheric winds from Fabry-Perot Doppler shift measurements of the 630-nm OI line-shape profile |
| VerfasserIn |
A. J. Gerrard, J. W. Meriwether |
| 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 ; 29, no. 9 ; Nr. 29, no. 9 (2011-09-02), S.1529-1536 |
| Datensatznummer |
250017084
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1529-2011.pdf |
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| Zusammenfassung |
| In this paper we present both night and day thermospheric wind observations
made with the Second-generation, Optimized, Fabry-Perot Doppler Imager
(SOFDI), a novel triple-etalon Fabry-Perot interferometer (FPI) designed to
make 24-h measurements of thermospheric winds from OI 630-nm emission.
These results were obtained from the northeastern United States and from
under the magnetic equator at Huancayo, Peru and demonstrate the current
instrument capability for measurements of Doppler shifts for either night or
day. We found the uncertainties in the measurements agree with expected
values based upon forward modeling calculations; nighttime wind components
having an uncertainty of ~20-m s−1 at 30-min resolution and daytime wind
components having an uncertainty of ~70-m s−1 at 20-min resolution. The
nighttime uncertainties are typically larger than those seen with traditional
single-etalon FPIs, which occur at the cost of being able to achieve daytime
measurements. The thermospheric wind measurements from Huancayo replicate
recently reported CHAMP zonal winds and are in disagreement with current
empirical wind climatologies. In addition, we discuss the incorporation of
how multiple point heads in the SOFDI instrument will allow for unique
studies of gravity wave activity in future measurements. |
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