국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Monte Carlo Model Insights into the Lunar Sodium Exosphere
저자	Hurley, Dana M.;; Killen, R. M.;; Sarantos, M.
Keyword	CORONAL MASS EJECTION;; DENSITY DISTRIBUTION;; DESORPTION;; EXOSPHERE;; LUNAR ROCKS;; METEOROID SHOWERS;; MONTE CARLO METHOD;; PHOTONS;; SODIUM;; SPATIAL DISTRIBUTION;; SURFACE REACTIONS;; VAPORIZING
URL	http://hdl.handle.net/2060/20120009884
보고서번호	GSFC.CPR.00151.2012
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Sodium in the lunar exosphere is released from the lunar regolith by several mechanisms. These mechanisms include photon stimulated desorption (PSD), impact vaporization, electron stimulated desorption, and ion sputtering. Usually, PSD dominates;; however, transient events can temporarily enhance other release mechanisms so that they are dominant. Examples of transient events include meteor showers and coronal mass ejections. The interaction between sodium and the regolith is important in determining the density and spatial distribution of sodium in the lunar exosphere. The temperature at which sodium sticks to the surface is one factor. In addition, the amount of thermal accommodation during the encounter between the sodium atom and the surface affects the exospheric distribution. Finally, the fraction of particles that are stuck when the surface is cold that are rereleased when the surface warms up also affects the exospheric density. In [1], we showed the "ambient" sodium exosphere from Monte Carlo modeling with a fixed source rate and fixed surface interaction parameters. We compared the enhancement when a CME passes the Moon to the ambient conditions. Here, we compare model results to data in order to determine the source rates and surface interaction parameters that provide the best fit of the model to the data.