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| Titel |
Interhemispheric structure and variability of the 5-day planetary wave from meteor radar wind measurements |
| VerfasserIn |
H. Iimura, D. C. Fritts, D. Janches, W. Singer, N. J. Mitchell |
| 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. 11 ; Nr. 33, no. 11 (2015-11-06), S.1349-1359 |
| Datensatznummer |
250121265
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1349-2015.pdf |
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| Zusammenfassung |
| A study of the quasi-5-day wave (5DW) was performed using meteor radars at
conjugate latitudes in the Northern and Southern hemispheres. These radars
are located at Esrange, Sweden (68° N) and Juliusruh, Germany
(55° N) in the Northern Hemisphere, and at Tierra del Fuego,
Argentina (54° S) and Rothera Station, Antarctica (68° S) in the Southern Hemisphere. The analysis was performed using data
collected during simultaneous measurements by the four radars from June 2010
to December 2012 at altitudes from 84 to 96 km. The 5DW was found to exhibit
significant short-term, seasonal, and interannual variability at all sites.
Typical events had planetary wave periods that ranged between 4 and 7 days,
durations of only a few cycles, and infrequent strongly peaked variances and
covariances. Winds exhibited rotary structures that varied strongly among
sites and between events, and maximum amplitudes up to ~ 20 m s−1. Mean horizontal velocity covariances tended to be largely
negative at all sites throughout the interval studied. |
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