題目: 土星的衛星-泰坦之大氣層 指導教授: 中央大學天文研究所 葉永烜 教授 中央研究院環境變遷中心 梁茂昌 教授 聯絡方式: 梁茂昌 教授 [email protected] 葉永烜 教授 [email protected] 計畫內容與目標: 泰坦為土星的衛星之一，是太陽系中除了地球之外，唯一擁有濃厚氮氣大氣層的天體，其 表面大氣壓力為地球的1.5倍。甲烷大概佔有2%。因為泰坦的重力很小，藉由氮氣和甲烷的 光化學反應與高能離子作用，可以產生非常複雜的碳氫化合物。這項研究工作是希望可以 了解在1000公里以上的化學作用，並評估氣膠(aerosol)在反應中的重要性。 Ionization state of the upper atmosphere of Titan Supervisors: Dr. Mao-Chang Liang (RCEC-AS/Institute of Astronomy, NCU) Dr. Wing Ip (Institutes of Astronomy and Space Science, NCU) Task Description and Goals Titan, a moon of Saturn, is the only object in the solar system other than Earth that possesses a dense nitrogen atmosphere; the surface pressure is a factor of 1.5 that of Earth. Tiny amount of methane (~2%) is present in the atmosphere. Because of the low gravity nature of Titan, photochemical and energetic ionic processes of nitrogen and methane lead to high abundances of hydrocarbons and nitriles that when complex enough, condense to form aerosols, resulting in a dusty and hazy atmosphere. Below ~1000 km altitude, neutral chemistry dominates; above that level ion-neutral chemistry becomes important. This work is to understand chemical processes above 1000 km and to evaluate the significance of the source of aerosols produced in this region. Interested undergraduate or incoming graduate students please contact Dr. Mao-Chang Liang ([email protected]) or Dr. Wing-Huen Ip ([email protected]) for more information.Y -- 〒作者：liching 來自：140.115.34.211 ◎二進位的世界【140.115.50.50‧bbs.ncu.cc】 轉 liching: 轉錄至 Astronomy_ 看板 19:41 06/18