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Preliminary study of Venus cloud layers with polarimetric data from SPICAV/VEx

机译:利用来自SPICAV / VEx的极化数据对金星云层进行初步研究

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We present unique polarization data from the SPICAV-IR spectrometer onboard ESA's Venus Express (VEx) spacecraft and a first retrieval of cloud parameters. The polarization data have been collected from 2006 to 2010, and cover mostly the northern hemisphere, in the 0.65 to 1.7 mu m spectral range. They contain information about latitudinal and longitudinal variations in the properties of Venus clouds and hazes, and about temporal variations in these properties. The degree of polarization measured on a few test orbits is in agreement with previous observations from the ground and from Pioneer Venus. Using numerical modeling to interpret the nadir observations, we retrieve mean values of r(eff) similar to 1 gm and v(eff) similar to 0.07 for, respectively, the effective radius and variance of the cloud particle size distribution and a refractive index n(r) = 1.42 +/- 0.02 at lambda = 1.101 mu m. We also derive an upper limit tau(h) = 0.17 at tau = 1.101 mu m for the haze optical thickness at high latitudes. All these values are in good agreement with previous determinations. (C) 2014 Elsevier Ltd. All rights reserved.
机译:我们展示了来自ESA金星快车(VEx)航天器上SPICAV-IR光谱仪的独特极化数据,以及首次获取云参数。极化数据是从2006年到2010年收集的,大部分覆盖了北半球,光谱范围为0.65至1.7微米。它们包含有关维纳斯云和阴霾性质的纬度和经度变化以及这些性质随时间变化的信息。在几个测试轨道上测得的极化度与地面和先锋金星的先前观测结果一致。使用数值模型解释最低点观测值,我们分别获得了有效的半径和云粒径分布的方差以及折射率n的r(eff)的平均值,类似于1 gm,v(eff)的平均值与0.07类似。 (r)= 1.42 +/- 0.02,λ=1.101μm。我们还针对高纬度的雾度光学厚度在tau = 1.101μm处得出上限tau(h)= 0.17。所有这些值都与先前的确定非常吻合。 (C)2014 Elsevier Ltd.保留所有权利。

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