Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations
Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations
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DOI：
10.5194/ars-17-213-2019
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发表时间：
2019-09
影响因子：
0.4
通讯作者：
C. Jacobi;C. Arras
中科院分区：
文献类型：
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作者：
C. Jacobi;C. Arras
抽象的。我们分析了流星雷达在COLM(51.3∘N，13.0∘E)观测到的中间层/低热层的潮汐(昼夜、半日、昼夜、季夜)位相和相关的风切变。将风切变位相与由COSMIC/FORMOSAT-3卫星测量的GPS无线电掩星信噪比(SNR)剖面得到的零星E(ES)出现率进行了比较。在中纬度地区，Es主要是由风切变产生的，在地球磁场的水平分量存在的情况下，这将导致离子在风切变为负的区域汇聚。因此，对于半日、四日和四日潮分量，我们发现雷达风切变与ES位相之间有很好的对应关系。然而，潮汐风切变与Es日信号并不对应。
Abstract. We analyze tidal (diurnal, semidiurnal, terdiurnal, quarterdiurnal) phases and related wind shear in the mesosphere/lower thermosphere as observed by meteor radar over Collm (51.3∘ N, 13.0∘ E). The wind shear phases are compared with those of sporadic E (Es) occurrence rates, which were derived from GPS radio occultation signal-to-noise ratio (SNR) profiles measured by the COSMIC/FORMOSAT-3 satellites. At middle latitudes Es are mainly produced by wind shear, which, in the presence of a horizontal component of the Earth's magnetic field, leads to ion convergence in the region where the wind shear is negative. Consequently, we find good correspondence between radar derived wind shear and Es phases for the semidiurnal, terdiurnal, and quarterdiurnal tidal components. The diurnal tidal wind shear, however, does not correspond to the Es diurnal signal.