Source dependency of exospheric sodium on Mercury

NCU Institutional Repository > 理學院 > 天文研究所 > 期刊論文 > Item 987654321/50916

請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50916

題名:	Source dependency of exospheric sodium on Mercury
作者:	Wang,YC;Ip,WH
貢獻者:	天文研究所
關鍵詞:	MESSENGER OBSERVATIONS;PLANET MERCURY;SURFACE;ATMOSPHERE;MAGNETOSPHERE;MODEL;EMISSION;ATOMS;LUNAR;TAIL
日期:	2011
上傳時間:	2012-03-27 18:12:50 (UTC+8)
出版者:	國立中央大學
摘要:	Due to a large solar radiation effect, the sodium exosphere exhibits many interesting effects, including the formation of an extended corona and a tail-like structure. The current suite of observations allows us to study some physical properties of the sodium exosphere, such as the source rates and the interaction with the surface, both experimentally and theoretically. In order to quantify the complex variations in the sodium exosphere in more detail, we use an exospheric model with the Monte-Carlo method to examine the surface interactions of a sodium atom, including the surface thermal accommodation rate and the sticking coefficient. The source rates from different components, such as the photon stimulated desorption (PSD), the meteoroid impact vaporization (MIV), and the solar wind ion sputtering (IS), can be constrained by comparing our exospheric model calculations with the published observational data. The detected terminator to limb (TL) ratio on the disk and the tail production rate can be explained with no sticking effect and small thermal accommodation rates. We also examine the best fit of the MIV source evolution, through comparison with the disk-averaged emission. The resultant discrepancy between the observations and the model fit may reflect the surface variation in the sodium abundance. A comprehensive mapping of the surface geochemical composition of the surface by the MESSENGER and Bepi-Colombo missions should give us more information about the nature of this surface-bound exosphere. (C) 2011 Elsevier Inc. All rights reserved.
關聯:	ICARUS
顯示於類別:	[天文研究所] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
index.html		0Kb	HTML	467	檢視/開啟

在NCUIR中所有的資料項目都受到原著作權保護.

社群 sharing

資料載入中.....