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>Hubble space telescope far-ultraviolet observations of Io: Determining atmospheric abundances, mapping the sulfur dioxide distribution, and correlating the molecular and atomic atmosphere.
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Hubble space telescope far-ultraviolet observations of Io: Determining atmospheric abundances, mapping the sulfur dioxide distribution, and correlating the molecular and atomic atmosphere.
Io's molecular and atomic atmosphere has been studied via far-ultraviolet spectroscopy obtained with the Hubble Space Telescope . Examination of an extensive data set reveals a sunlit SO2 atmosphere which is temporally stable on a global scale, with only small local changes. An anti-/sub-Jovian asymmetry in the SO2 distribution persists in all of the observations. The atmosphere is densest in the anti-Jovian equatorial regions, with a maximum column density of 5.0 x 10 16 cm-2 at 140° longitude. The SO2 atmosphere also has greater latitudinal extent on the anti-Jovian hemisphere as compared to the sub-Jovian. The atmospheric distribution is best correlated with the location of known volcanic plumes. Theoretical sublimation atmosphere models cannot reproduce the asymmetry alone. Atomic S, O and Cl are also detected. Their abundances are derived and compared to the SO2. Sulfur is measured at a relative abundance of 9 x 10-3 compared to SO2, oxygen at 0.05, and chlorine at 3-8.5 x 10 -4.
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机译:通过哈勃太空望远镜获得的远紫外光谱研究了艾欧的分子和原子气氛。对大量数据的检查显示,阳光照射下的SO2气氛在全球范围内是暂时稳定的,只有很小的局部变化。在所有观察结果中,SO2分布仍存在反-/-或不符合Jovian的不对称性。反Jovian赤道地区的大气最稠密,经度为140°时最大柱密度为5.0 x 10 16 cm-2。与副木星相比,SO2大气在反木星半球上的纬度范围也更大。大气分布与已知火山羽的位置最相关。理论升华气氛模型不能单独再现不对称性。还检测到原子S,O和Cl。得出其丰度并将其与SO2进行比较。与SO2、0.05的氧气和3-8.5 x 10 -4的氯相比,硫的相对丰度为9 x 10-3。
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