First observations of polar mesosphere summer echoes in Antarctica
First observations of polar mesosphere summer echoes in Antarctica
复制标题
首次观测南极洲极地中间层夏季回波
DOI：
10.1029/1999ja900226
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发表时间：
1999
影响因子：
--
通讯作者：
H. Soldi
中科院分区：
文献类型：
--
作者：
R. Woodman;B. Balsley;F. Aquino;L. Flores;E. Vazquez;M. Sarango;M. Huaman;H. Soldi
1993年初在南极洲（南纬62°）乔治王岛的秘鲁基地安装了一部25千瓦峰值功率50兆赫的雷达。在运行的第一年的1月底和2月初，对极地中层夏季回波（PMSEs）进行了搜索，结果为阴性。这些结果已经在文献[Balsley等人，1993; 1995]。我们在这里报告的结果，在南夏季的第二年（1994年）的运作。第二年的观察开始得更早，即，更接近南极夏至。在此期间观测到了PMSE，尽管回波比人们根据早期在北方半球相当纬度（65°N）的扑克平原雷达结果所预期的要弱得多。因此，在两个半球的PMSE强度中存在大的和可测量的不对称性。我们通过假设两半球夏季中层顶温度的差异为0.75 K来解释这种不对称性。这种差异已估计使用的扑克牌平PMSE功率的变化之间的经验关系作为由质谱仪非相干散射扩展（MSISE-90）模型给出的温度的函数。
A 25-kW peak power 50-MHz radar was installed at the Peruvian base on King George Island, Antarctica (62°S), in early 1993. A search for polar mesospheric summer echoes (PMSEs) was made during late January and early February of the first year of operation with negative results. These results have been reported in the literature [Balsley et al., 1993; 1995]. We report here results obtained during the austral summer of the second year (1994) of operation. Observations during the second year were begun earlier, i.e., closer to the austral summer solstice. PMSEs were observed during this period, albeit the echoes were much weaker than what one would expect based on earlier Poker Flat radar results at a comparable latitude (65°N) in the Northern Hemisphere. A large and measurable asymmetry in PMSE strength in the two hemispheres therefore exists. We explain this asymmetry by postulating a difference in summer mesopause temperatures between the two hemispheres of ∼7.5 K. This difference has been estimated using an empirical relationship between the variations of the Poker Flat PMSE power as a function of temperature given by the mass spectrometer incoherent scatter extended (MSISE-90) model.