Cassini-UVIS observation of dayglow FUV emissions of carbon in the thermosphere of Venus
Cassini-UVIS observation of dayglow FUV emissions of carbon in the thermosphere of Venus
复制标题
卡西尼-UVIS 观测金星热层中碳的日光 FUV 排放
DOI：
10.1016/j.icarus.2012.06.002
复制
发表时间：
2012
期刊：
影响因子：
3.2
通讯作者：
G. Gladstone
中科院分区：
文献类型：
--
作者：
B. Hubert;J. Gérard;J. Gustin;D. Bisikalo;V. Shematovich;G. Gladstone
我们分析了卡西尼号飞越金星过程中UVIS仪器在0.37 nm分辨率下获得的FUV空间分辨白天辉光光谱。利用最小二乘拟合法确定了碳原子在126.1、156.1和165.7 nm处的紫外多重态的强度，并将其应用于紫外可见光谱仪沿卡西尼轨道记录的所有日光光谱。这些强度与这些辐射的完整辐射传输模型的结果进行了比较，该模型包括已知的光子光化学源和太阳光的共振散射。金星热层的碳密度分布从来没有被直接测量过，而且是从模型中获得的。我们发现这些观测和模拟之间存在严重的不一致，这可以通过将比例因子应用于碳柱来解释。所需的比例因子随着太阳天顶角的增加而单调增加，这表明这种分歧可能源于光化学，可能涉及碳密度高度敏感的分子氧的光化学。
We analyze FUV spatially-resolved dayglow spectra obtained at 0.37nm resolution by the UVIS instrument during the Cassini flyby of Venus. The intensities of the ultraviolet multiplets of carbon at 126.1, 156.1 and 165.7nm are determined using a least squares fit technique applied to all dayglow spectra recorded by UVIS along the Cassini track. These intensities are compared with the results of a full radiative transfer model of these emissions, that includes the known photochemical sources of photons and resonant scattering of sunlight. The carbon density profile of the Venus thermosphere has never been directly measured and is taken from a model. We find a serious disagreement between these observations and modeling that can be accounted for by applying a scaling factor to the carbon column. This needed scaling factor is found to increase monotonically with solar zenith angle, suggesting a possible photochemical origin to the disagreement, possibly involving the photochemistry of molecular oxygen to which the carbon density is highly sensitive.
DOI：
10.6028/nbs.nsrds.68
发表时间：
1980-12
期刊：
--
影响因子：
--
作者：
J. Reader;C. Corliss;W L Wiese;G A Martin
通讯作者：
J. Reader;C. Corliss;W L Wiese;G A Martin