Abstract:
The solar wind ions detectors onboard the spacecraft Chang'E-1(CE-1)have made a great contribution in advancing the understanding ofthesolar wind-Moon interaction and the induced near-Moon plasma environment. Several features ofsolar wind ions near the Moon were observed by tlle CE-1 on Dec 30, 2007:1)both protons(H
+)and alpha particles(He
2+)were identified in the slow solar wind; 2)the accelerated solar wind pickup ions were repeatedly observed on the lunar dayside under the nterplanetary magnetic field(IMF)B
y dominant conditions; 3)the accelerated pickup ions show being angle-dependent clearly and location-dependent sensitively; 4)under the IMF positive(negative)B
y conditions, the decelerated (accelerated) solar wind H
+ intruded deep into the wake from the wake boundary in the northern hemisphere. while the He
2+population intruded less deep than H
+. The revelation ofthese features may be of great help to understand the near-Moon plasma environment.