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| Titel |
A dominant acoustic-gravity mode in the polar thermosphere |
| VerfasserIn |
A. K. Fedorenko, A. V. Bespalova, O. K. Cheremnykh, E. I. Kryuchkov |
| 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 ; 33, no. 1 ; Nr. 33, no. 1 (2015-01-27), S.101-108 |
| Datensatznummer |
250121153
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| Publikation (Nr.) |
 copernicus.org/angeo-33-101-2015.pdf |
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| Zusammenfassung |
| The article presents a summary of the main findings of the systematic study of
acoustic-gravity waves (AGWs) in the polar thermosphere. This study was based on
the in situ measurements made by the Dynamics Explorer 2 (DE2)
spacecraft late in its mission when it descended low enough
(250–400 km). It was found out that AGWs in the polar thermosphere are observed within a
narrow frequency band close to the Brunt–Väisälä frequency and with
horizontal wavelengths about 500–600 km. The broadband spectrum of
travelling ionospheric disturbance (TID) frequencies observed by radars is caused by the Doppler effect. The AGW
amplitudes do not depend on the altitude, but grow almost linearly with the
wind velocity. They propagate towards the wind. |
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