Lunar tidal winds in the upper atmosphere over Collm
The lunar semidiurnal tide in winds measured at around 90 km altitude has been isolated with amplitudes observed up to 4 m s<sup>–1</sup>. There is a marked amplitude maximum in October and also a considerable phase variation with season. The average variation of phase with height ind...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2000-12-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/18/1645/2000/angeo-18-1645-2000.pdf |
| Summary: | The lunar semidiurnal tide in winds measured
at around 90 km altitude has been isolated with amplitudes observed up to 4 m s<sup>–1</sup>.
There is a marked amplitude maximum in October and also a considerable phase
variation with season. The average variation of phase with height indicated a
vertical wavelength of more than 80 km but this, and other results, needs to be
viewed in the light of the considerable averaging required to obtain statistical
significance. Large year-to-year variations in both amplitude and phase were
also found. Some phase comparisons with the GSWM model gave reasonable agreement
but the model amplitudes above a height of 100 km were much larger than those
measured. An attempt to make a comparison with the lunar geomagnetic tide did
not yield a statistically significant result.</p>
<p style="line-height: 20px;"><b>Key words: </b>Meteorology and atmospheric dynamics (middle
atmosphere dynamics; waves and tides) |
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| ISSN: | 0992-7689 1432-0576 |