Measurement of momentum flux using two meteor radars in Indonesia
Two nearly identical meteor radars were operated at Koto Tabang (0.20° S, 100.32° E), West Sumatra, and Biak (1.17° S, 136.10° E), West Papua, in Indonesia, separated by approximately 4000 km in longitude on the Equator. The zonal and meridional momentum flux, <i>u</i>′<i>w<...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-03-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/34/369/2016/angeo-34-369-2016.pdf |
| Summary: | Two nearly identical meteor radars were operated at Koto Tabang
(0.20° S, 100.32° E), West Sumatra, and Biak (1.17° S,
136.10° E), West Papua, in Indonesia, separated by approximately
4000 km in longitude on the Equator. The zonal and meridional momentum flux,
<i>u</i>′<i>w</i>′ and <i>v</i>′<i>w</i>′, where <i>u</i>, <i>v</i>, and <i>w</i> are the eastward, northward, and vertical wind
velocity components, respectively, were estimated at 86 to 94 km altitudes
using the meteor radar data by applying a method proposed by Hocking (2005).
The observed <i>u</i>′<i>w</i>′ at the two sites agreed reasonably well at 86, 90, and 94 km
during the observation periods when the data acquisition rate was
sufficiently large enough. Variations in <i>v</i>′<i>w</i>′ were consistent between 86,
90, and 94 km altitudes at both sites. The climatological variation in the
monthly averaged <i>u</i>′<i>w</i>′ and <i>v</i>′<i>w</i>′ was investigated using the long-term radar data
at Koto Tabang from November 2002 to November 2013. The seasonal variations
in <i>u</i>′<i>w</i>′ and <i>v</i>′<i>w</i>′ showed a repeatable semiannual and annual cycles, respectively.
<i>u</i>′<i>w</i>′ showed eastward values in February–April and July–September and <i>v</i>′<i>w</i>′ was
northward in June to August at 90–94 km, both of which were generally anti-phase
with the mean zonal and meridional winds, having the same periodicity. Our
results suggest the usefulness of the Hocking method. |
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| ISSN: | 0992-7689 1432-0576 |