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研究生： 林怡伶
I-Ling Lin
論文名稱： 土衛八Iapetus的外球層模型
An Exospheric Model of Iapetus
指導教授： 葉永烜
Wing Huen Ip
口試委員:
學位類別： 碩士
Master
系所名稱： 地球科學學院 - 太空科學研究所
Graduate Institute of Space Science
畢業學年度： 95
語文別： 中文
論文頁數： 62
中文關鍵詞： 土星衛星 、溫度模擬 、溫度模型 、土星 、土衛八 、外球層 、外逸層
外文關鍵詞： Exosphere, Thermal model, Saturn, Saturnian satellite, Iapetus, Thermal simulation, Temperature
相關次數： 點閱：10  下載：0 
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    • 自從土衛八Iapetus被發現以來，其對比鮮明且不對稱分布的反照率(Albedo)一直是爭議點。在2004年的觀測中，卡西尼(Cassini)探測船拍攝到許多前所未見的清晰影像，引導我們重新審視這顆中等大小的冰質衛星--Iapetus。其中，表面溫度的測量，對於了解Iapetus上揮發性冰物質之昇華經歷與傳輸過程，有著特殊地位。例如，在假設外球層存在的前提下，我們有興趣去探討一些氣體分子：氧氣、二氧化碳等等之可能的時間變化與表面濃度分布。為了達到此目的，首先根據不對稱分布之反照率建立了表面溫度模型。然後，在模擬這些氣體分子在Iapetus表面彈跳的過程中，將此表面溫度模型應用於Monte Carlo彈道模型中。這個數值模擬模型，目的是為2007年卡西尼探測船飛掠Iapetus之觀測，提供一個預測結果。

    Because of its remarkable asymmetry in its surface albdeo distribution, Iapetus has been the focus of attention since its first discovery. The Cassini observations in 2004 have given us a new view of this icy satellite of medium size. The measurements of the surface temperature are of particular value for the understanding of the sublimation history and surface transport of volatile ice on Iapetus. For example, we are interested in knowing the possible time variations and surface distributions of the O2, CO2 and other gas molecules if a tenuous exosphere can exist. For this purpose, a thermal model with the albedo asymmetry has been constructed. The computed surface temperature distribution is used as input to a Monte Carlo model of the ballistic transport of the gas molecules across the surface of Iapetus. This numerical simulation is performed in preparation of the close encounter observations with Iapetus by the Cassini spacecraft in 2007.

    目 錄 摘要 ………………………………………………………… i ABSTRACT ………………………………………………………… ii 誌謝 ………………………………………………………… iii 目錄 ………………………………………………………… v 圖目錄 ………………………………………………………… vi 表目錄 ………………………………………………………… vii 第一章 概說…………………………………………………… 1 1-1 土衛八Iapetus………………………………………… 1 1-2 Iapetus的表面組織特性……………………………… 4 1-3 卡西尼探測船的新發現……………………………… 6 1-4 2007年9月10日的飛掠觀測…………………………… 13 第二章 Iapetus之表面溫度模型……………………………… 15 2-1 無大氣層天體(Airless bodies)之表面溫度模型… 15 2-2 能量守恆方程式……………………………………… 17 2-3 熱傳導方程式………………………………………… 19 2-4 初步模擬結果—一日內之表面溫度變化…………… 21 第三章 Iapetus之外球層模型………………………………… 23 3-1 彈道軌跡之外球層模型……………………………… 23 3-2 Hodges之外球層模型—模擬方法…………………… 25 3-3 Hodges之外球層模型—考慮條件…………………… 28 3-4 彈道軌跡模型與Hodges模型之比較………………… 31 第四章 計算結果與討論……………………………………… 32 4-1 黑暗物質之研究簡述………………………………… 32 4-2 Iapetus之表面溫度模型—全球溫度分布…………… 35 4-3 Iapetus之外球層模型—二氧化碳…………………… 38 4-4 Iapetus之外球層模型—氧分子……………………… 43 第五章 未來研究方向………………………………………… 46 5-1 Iapetus之其他模擬…………………………………… 46 5-2 應用於其他天體之外球層…………………………… 47 參考資料 ………………………………………………………… 48 期刊 ………………………………………………………… 48 網頁 ………………………………………………………… 49 附錄A 水星系統中不同成分之光電離作用平均存在時間… 50 附錄B 各種成分之壓力關係式係數………………………… 51

    期刊
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    網頁
    Cassini-Huygens Home: http://saturn.jpl.nasa.gov
    NASA-ADS：http://adsabs.harvard.edu/abstract_service.html

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