Direct measurement of winds on Titan
Direct measurement of winds on Titan
复制标题
直接测量土卫六上的风
DOI：
10.1029/2000gl012617
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发表时间：
2001
影响因子：
5.2
通讯作者：
D. Buhl
中科院分区：
文献类型：
--
作者：
T. Kostiuk;K. Fast;T. Livengood;T. Hewagama;J. Goldstein;F. Espenak;D. Buhl
我们报告了对土卫六大气层风速的首次直接测量，这是太阳系中仅有的两个缓慢旋转天体、大气层稠密的例子之一，也是卡西尼号任务的主要目标。纬向风速由土卫六平流层 (∼0.1–7 mbar) 发射的乙烷谱线的多普勒频移确定，通过近 12 µm 的红外外差光谱测量 (λ/Δ λ ≥ 106)。沿全球自转方向的顺行纬向环流的建立具有 94% 的统计置信度。结果提供了有关泰坦气象学约束缓慢旋转物体的动力学理论的信息，提供了其他方式无法获得的数据来优化卡西尼惠更斯探测器的研究，并展示了远程测量小型遥远物体上的风的能力。
We report the first direct measurement of wind velocity in the atmosphere of Titan, one of only two examples in our solar system of a slowly‐rotating body with a dense atmosphere and a prime target of the Cassini mission. Zonal wind velocity was determined from Doppler shift of ethane lines emitted from Titan's stratosphere (∼0.1–7 mbar) measured by infrared heterodyne spectroscopy near 12 µm (λ/Δ λ ≥ 106). Prograde zonal circulation, in the direction of global rotation, is established with 94% statistical confidence. Results provide information regarding Titan meteorology constraining dynamical theories for slowly‐rotating bodies, provide otherwise unobtainable data to optimize the Cassini Huygens Probe investigations, and demonstrate the capability for remotely measuring winds on a small, distant object.