Is VHF Fresnel reflectivity due to low frequency buoyancy waves
Is VHF Fresnel reflectivity due to low frequency buoyancy waves
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VHF 菲涅耳反射是由于低频浮力波引起的吗
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
R. Vincent
中科院分区：
文献类型：
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作者：
T. Vanzandt;R. Vincent
相对于其他方向，甚高频雷达回波在天顶附近大大增强。这种增强一定是由于折射率水平分层的叠层的反射。折射率层压是由于低频浮力（内部重力）波作用于折射率背景垂直梯度的位移造成的。VANZANDT（1982）指出，对流层和平流层下部观测到的中尺度风波动谱是由浮力（重力）波的普适谱模拟的。由于观测到的频谱是红色的，浮力波模型的垂直位移谱在天顶附近被强烈增强。换句话说，由此产生的电子活动不规则性是强烈分层的。
VHF radar echoes are greatly enhanced near the zenith relative to other directions. This enhancement must be due to reflection from horizontally stratified laminate of refractive index. The refractivity laminate are due to the displacements of low frequency buoyancy (internal gravity) waves acting on the background vertical gradient of refractivity. VANZANDT (1982) has shown that the observed spectra of mesoscale wind fluctuations in the troposphere and lower stratosphere are modeled by a universal spectrum of buoyancy (internal gravity) waves. Since the observed frequency spectrum is red, the buoyancy wave model of the vertical displacement spectrum is strongly enhanced near the zenith. In other terms, the resulting refractivity irregularities are strongly stratified.