Zheng-Xian Chen; Wing-Huen IP
Two of the five THEMIS spacecraft for multiple measurements of Earth’s magnetosphere were diverted in 2010 to the lunar orbits for in-situ observations of the deep magnetotail and the Moon - solar wind interaction effects. These two artificial lunar satellites, renamed ARTEMIS P1 and P1, have produced a large amount of plasma data since then. Because of the potential interest in initiating a lunar exploration program in Taiwan, it is timely and interesting to make a survey of the energetic charged particle environments as the Moon moves across different regions of the magnetosphere. We are particularly interested in the energetic particle spectra measured in the magnetotail as enhanced ion sputtering and plasma interaction might occur as indicated by ground-based and the LADEE spacecraft observations of the optical emission in the atomic sodium cloud surrounding the Moon. In this work, we will show and compare the average properties of the energetic particle population in different plasma regions around the orbit of the Moon, namely, the perpendicular and parallel shock regimes upstream of the bow shock, the magnetosheath, the tail lobe and the current sheet, making use of the Chao et al. (2002) model of the magnetosphere to identify the relative positions of the ARTEMIS spacecraft for diagnostic purpose. On this basis, we would be able to examine the transient process associated with magnetic reconnection during magnetospheric storms/substorms.