Acceleration of scattered solar wind protons at the polar terminator of the Moon: Results from Chang'E‐1/SWIDs
Acceleration of scattered solar wind protons at the polar terminator of the Moon: Results from Chang'E‐1/SWIDs
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DOI：
10.1029/2010gl042891
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发表时间：
2010-04
影响因子：
5.2
通讯作者：
X.‐D. Wang;W. Bian;J.‐S. Wang;J.‐J. Liu;Y. Zou;Hb Zhang;C. Lü;J.‐Z. Liu;W. Zuo;
中科院分区：
文献类型：
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作者：
X.‐D. Wang;W. Bian;J.‐S. Wang;J.‐J. Liu;Y. Zou;Hb Zhang;C. Lü;J.‐Z. Liu;W. Zuo;
我们报告了嫦娥一号航天器上的太阳风离子探测器（SWID）在月球的终结者区域附近观测到的加速粒子。当航天器穿过终结者时，探测到能量为200 eV/q的离子流。当航天器移动到月球的反日下点时，这些离子的能量增加了600至1500 eV。当IMF By分量占主导地位且为负/正时，这种现象发生在北/南极。提出这些粒子是散射的太阳风质子，在太阳风对流电场的作用下加速，E × B在月球尾流两侧的双极电场中漂移。这一机制允许新的太阳风质子部分进入中央月球尾流，并提供了一种可能性，研究质子散射的性质在月球的昼面。
We report accelerated particles observed by Solar Wind Ion Detectors (SWIDs) on Chang'E‐1 spacecraft close to terminator regions of the Moon. As the spacecraft crosses the terminator, a stream of ions with energy of ∼200eV/q are detected. As the spacecraft moves to the anti‐subsolar point of the Moon, the energy of these ions increase by 600 ∼ 1500eV. This phenomenon occurs at north/south pole when IMF By component is dominant and negative/positive. It is proposed these particles are scattered solar wind protons, accelerated by the convection electric field of the solar wind and E × B drift in the ambipolar electric field at the flank of the lunar wake. This mechanism allows a new portion of solar wind protons to enter the central lunar wake, and provides a possibility to study the property of proton scattering at the dayside of the Moon.