The Measurements of the Gas Density Distributions and Composition in the Water Plumes of Enceladus by the INMS Instrument on Cassini

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Title:	The Measurements of the Gas Density Distributions and Composition in the Water Plumes of Enceladus by the INMS Instrument on Cassini
Authors:	許仁愷;Hsu,Jen-kai
Contributors:	太空科學研究所
Keywords:	土衛二;卡西尼任務;離子及中性粒子質譜儀;羽狀氣體噴泉;水冰粒子;塵埃粒子;Enceladus;Cassini Mission;INMS;Gas Plume;icy grain;dust particle
Date:	2013-08-15
Issue Date:	2013-10-08 15:09:06 (UTC+8)
Publisher:	國立中央大學
Abstract:	美國NASA的太空計畫，卡西尼─惠更斯任務，從2004年起，進行了許多次的飛掠經過了土星的冰衛星─Encaladus。發現在衛星的南極地區，有著噴發出水冰的羽狀噴泉。卡西尼太空船上的”離子及中性粒子質譜儀”在飛掠的過程中，測量到這羽狀噴泉中水分子和其他分子的密度分布。在本篇論文中，我們將取得E3, E5, E7, E14, E17 and E18共6次的飛掠的資料，並針對羽狀噴泉中的主要成分CO2, N2 和 H2進行資料處理，並優化資料中CO2, N2 和 H2的數據，以進行分析和探討；由於氣體噴泉中含有許多微小的水冰，會在資料中造成奇特的尖狀資料點(spikes)，針對這些資料點進行篩選，討論其可能的形成原因。綜合以上試著幫助我們更了解Enceladus羽狀噴泉的密度分布和其組成成分。 In the satellite tour mission of the Cassini-Huygens project, the Cassini Orbiter made several flybys through the water gas plume of the active icy satellite, Enceladus. The Ion Neutral Mass Spectrometer (INMS) onboard obtained measurements of the density distributions of the water molecule and other minor species along the trajectories. In this study, we will present the optimization of CO2, N2 and H2 data for 6 flybys – E3, E5, E7, E14, E17 and E18. We also pick out the spikes appearing in the counts data and discuss the possible formation of these spikes. These will help us understand the gas density distributions and compositions in the water plume of Enceladus.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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