A Report on Radar Observations of 5-8-day Waves in the Equatorial MLT Region
A Report on Radar Observations of 5-8-day Waves in the Equatorial MLT Region
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DOI：
10.2151/jmsj.84a.295
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发表时间：
2006-07
影响因子：
3.1
通讯作者：
S. Sridharan;T. Tsuda;Takuji Nakamura;R. Vincent;Effendy
中科院分区：
文献类型：
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作者：
S. Sridharan;T. Tsuda;Takuji Nakamura;R. Vincent;Effendy
利用中频和气象雷达对Koto Tabang（0.2°S，100.3°E）、Pontianak（0°，109.3°E）和帕蒙佩克（7.5°S，107.5°E）上空水平风的观测资料，研究了印度尼西亚上空中层和低热层（MLT）5-8天波的特征。纬向风的波活动大于纬向风，2003年波活动最大值出现在北方春分前后。2004年6 - 8月纬向风中的波浪活动较大。在此期间，坤甸上空的波的相位领先于Koto Tabang上空的波，表明波以纬向波数1向西传播。赤道站点Koto Tabang和Pontianak的波周期为6.3 - 7.0天，而在南半球站点帕蒙佩克，波周期为6.2-6.4天。这表明，波的优势周期随纬度而变化。波的振幅和相位结构与高度之间的三个站点考虑是相似的。即使在CPEA（赤道大气耦合过程）活动期间（2004年4月10日至5月9日）的后半期，该波也主导了帕蒙佩克上空的MLT动力学，其主导波周期接近6.4天。在运动期的最后四分之一期间，波幅较大。
The MF and Meteor radar observations of horizontal winds over Koto Tabang (0.2°S, 100.3°E), Pontianak (0°, 109.3°E), and Pameungpeuk (7.5°S, 107.5°E) are utilized to study the characteristics of 5-8-day waves in the mesosphere and lower thermosphere (MLT) region over Indonesia. The wave activity is larger in zonal wind than in meridional wind and in the year 2003, it maximizes before and after northern hemispheric spring equinox. In the year 2004, the wave activity in zonal wind is larger during June-August 2004. During this period, the phase of the wave over Pontianak leads that over Koto Tabang, indicating that the wave is westward propagating with zonal wave number 1. The wave period ranges from 6.3 to 7.0 days over the equatorial sites Koto Tabang and Pontianak, whereas over the southern hemispheric site, Pameungpeuk, it is in the range 6.2-6.4 days. This shows that the dominant period of the wave changes with latitude. The amplitude and phase structures of the wave with altitude are similar among the three sites considered. The wave dominates the MLT dynamics over Pameungpeuk even during second half of CPEA (Coupling Processes in the Equatorial Atmosphere) campaign period (10 April-9 May 2004) with similar dominant wave period near 6.4-days. The wave amplitude is larger during last quarter of the campaign period.