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 |
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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 |
| _version_ | 1818083910457753600 |
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| author | N. Matsumoto A. Shinbori D. M. Riggin T. Tsuda |
| author_facet | N. Matsumoto A. Shinbori D. M. Riggin T. Tsuda |
| author_sort | N. Matsumoto |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T19:45:30Z |
| format | Article |
| id | doaj.art-3e445cd4a1b84f248911f7d092329418 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-10T19:45:30Z |
| publishDate | 2016-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-3e445cd4a1b84f248911f7d0923294182022-12-22T01:35:53ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762016-03-013436937710.5194/angeo-34-369-2016Measurement of momentum flux using two meteor radars in IndonesiaN. Matsumoto0A. Shinbori1D. M. Riggin2T. Tsuda3Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, 611-0011, Kyoto, JapanResearch Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, 611-0011, Kyoto, JapanGATS Inc., 3360 Mitchell Lane, Boulder, CO 80301, USAResearch Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, 611-0011, Kyoto, JapanTwo 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.https://www.ann-geophys.net/34/369/2016/angeo-34-369-2016.pdf |
| spellingShingle | N. Matsumoto A. Shinbori D. M. Riggin T. Tsuda Measurement of momentum flux using two meteor radars in Indonesia Annales Geophysicae |
| title | Measurement of momentum flux using two meteor radars in Indonesia |
| title_full | Measurement of momentum flux using two meteor radars in Indonesia |
| title_fullStr | Measurement of momentum flux using two meteor radars in Indonesia |
| title_full_unstemmed | Measurement of momentum flux using two meteor radars in Indonesia |
| title_short | Measurement of momentum flux using two meteor radars in Indonesia |
| title_sort | measurement of momentum flux using two meteor radars in indonesia |
| url | https://www.ann-geophys.net/34/369/2016/angeo-34-369-2016.pdf |
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