TITAN'S SURFACE BRIGHTNESS TEMPERATURES
TITAN'S SURFACE BRIGHTNESS TEMPERATURES
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DOI：
10.1088/0004-637x/691/2/l103
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发表时间：
2009-02-01
影响因子：
7.9
通讯作者：
Courtin, R.
中科院分区：
文献类型：
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作者：
Jennings, D. E.;Flasar, F. M.;Courtin, R.
土卫六表面的辐射可以通过19微米(530厘米-1)的热红外低不透明度光谱窗口从太空中探测到。通过结合卡西尼号头四年的复合红外光谱仪观测，我们绘制了纬向平均表面亮度温度的纬度分布图。根据辐射度与发射角度的依赖关系，对测量的大气不透明度进行了校正。在惠更斯着陆点附近的赤道纬度处，表面亮温为93.7+/-0.6K，与现场测量结果吻合较好。气温向两极下降，北纬87度达到90.5+/-0.8K，南纬88度达到91.7+/-0.7K，经向最大温度分布在S 10度附近，与土卫六冬末一致。
Radiance from the surface of Titan can be detected from space through a spectral window of low opacity in the thermal infrared at 19 mu m (530 cm-1). By combining Composite Infrared Spectrometer observations from Cassini's first four years, we have mapped the latitude distribution of zonally averaged surface brightness temperatures. The measurements are corrected for atmospheric opacity as derived from the dependence of radiance on the emission angle. At equatorial latitudes near the Huygens landing site, the surface brightness temperature is found to be 93.7 +/- 0.6K, in excellent agreement with the in situ measurement. Temperature decreases toward the poles, reaching 90.5 +/- 0.8K at 87 degrees N and 91.7 +/- 0.7K at 88 degrees S. The meridional distribution of temperature has a maximum near 10 degrees S, consistent with Titan's late northern winter.