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首页> 外文会议>Remote Sensing of Clouds and the Atmosphere XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6745 >Anisotropic refractive index fluctuations spectrum in the stratosphere sensed from balloon-borne observations of stellar scintillation
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Anisotropic refractive index fluctuations spectrum in the stratosphere sensed from balloon-borne observations of stellar scintillation

机译：从恒星闪烁的球囊观测观测到的平流层各向异性折射率波动谱

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摘要

Scintillation effects caused by the fluctuations of the refractive index of air are not negligible in the stratosphere. Recent experiments highlight the composite nature of optical turbulence in the stratosphere. We present an analytical model of scintillation based on a 3-D model of anisotropic and isotropic refractive index fluctuations spectrum that predicts scintillation rates inside the Rytov regime. This model uses a multi-layer decomposition of the turbulence profile. The effect of anisotropy leads to significant scintillation rates when a source is observed with a horizontal line of sight. Astronomical observations consisting in stellar scintillation made from balloon-borne spectrometer AMON-RA allow us to remotely probe statistical characteristics in the stratosphere, to validate the model of scintillation developed herein and to obtain refined values of its parameters. Data reduction from these observations brings out values of the inner scale of the anisotropic spectrum. We retrieve metric values of the inner scale that are compatible with space-based measurements. We find a major contribution of the anisotropic spectrum relatively to the isotropic contribution. This effect is particularly noticeable when the sight line plunges into the atmosphere, leading to strong scintillation as well as coupled chromatic refraction effects. This makes clear the presence of gravity waves in the stratosphere.
机译：在平流层中，由空气折射率波动引起的闪烁效应不可忽略。最近的实验突出了平流层中光学湍流的复合性质。我们提出了一种基于各向异性和各向同性折射率波动谱的3-D模型的闪烁分析模型，该模型可预测Rytov体制内的闪烁速率。该模型使用湍流轮廓的多层分解。当用水平视线观察光源时，各向异性的影响会导致明显的闪烁率。由气球式光谱仪AMON-RA进行的恒星闪烁构成的天文观测使我们能够远程探测平流层中的统计特征，以验证本文开发的闪烁模型并获得其参数的精确值。从这些观察中得到的数据减少带来了各向异性光谱内部尺度的值。我们检索与基于空间的测量值兼容的内部刻度的度量值。我们发现各向异性频谱相对于各向同性的主要贡献。当视线进入大气时，这种效果尤其明显，从而导致强烈的闪烁以及耦合的色光折射效果。这清楚了平流层中重力波的存在。

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