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| Titel |
Simultaneous observations of the 2-day wave at London (43°N, 81°W) and Saskatoon (52°N, 107°W) near 91 km altitude during the two years of 1993 and 1994 |
| VerfasserIn |
T. Thayaparan, W. K. Hocking, J. MacDougall, A. H. Manson, C. E. Meek |
| 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 ; 15, no. 10 ; Nr. 15, no. 10, S.1324-1339 |
| Datensatznummer |
250012979
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| Publikation (Nr.) |
 copernicus.org/angeo-15-1324-1997.pdf |
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| Zusammenfassung |
| Simultaneous observations are valuable in
providing further insights into the character of the quasi 2-day wave. In this
study we investigate the period and amplitude for the quasi 2-day wave near 91
km using MF radars at London and Saskatoon, Canada, and in addition look at
possible values of the zonal wave number. The results of the present study bring
out certain new aspects of the quasi 2-day wave at mid-latitudes in the Northern
Hemisphere. In particular we show that the period of the quasi 2-day wave
determined from our study (specially at large amplitudes) is smaller (46–47 h)
than the 51–52 h period often suggested by other Northern Hemisphere results,
and that the periods also showed variability as a function of time. We also draw
attention to the annual variability, and especially highlight the occurrence of
the wave in non-summer months. Our observations show significant wave
correlation between the London and Saskatoon sites during time intervals of
strong 2-day wave activity. These results suggest that the 2-day waves of 1993/4
are westward propagating waves of zonal wave number 3, although sometimes the
zonal wave number 5 is also indicated (specially at large amplitudes). Our study
also contributes additional mid-latitude geographical data which should aid in
developing a better picture of the quasi 2-day wave. |
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