Global Maps of Solar Wind Electron Modification by Electrostatic Waves Above the Lunar Day Side: Kaguya Observations
Global Maps of Solar Wind Electron Modification by Electrostatic Waves Above the Lunar Day Side: Kaguya Observations
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DOI：
10.1029/2021gl095260
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发表时间：
2021-09
影响因子：
5.2
通讯作者：
Y. Harada;Y. Kasahara;M. Nishino;S. Kurita;Yoshifumi Saito;S. Yokota;A. Kumamoto;F. Takahashi;H. Shimizu
中科院分区：
文献类型：
--
作者：
Y. Harada;Y. Kasahara;M. Nishino;S. Kurita;Yoshifumi Saito;S. Yokota;A. Kumamoto;F. Takahashi;H. Shimizu
月球以与陆地前震类似的方式驱动上游太阳风中可观测到的扰动。最近的观察表明，月球日面静电波可能由两种不同的驱动机制产生，两者都涉及来自月球地壳磁场的反射粒子。然而，它们与月球磁异常全球分布的关系尚未得到充分表征。在这里，我们利用极地轨道辉夜来生成第一个全球静电波地图和月球白天上方太阳风电子修改图。这些地图清楚地表明这两个特征与月球地壳磁场相关。此外，我们观察到不同行星际磁场方向的电子修饰的不同特征。月壳磁场引起大范围的反射电子和离子强度，从而充当研究反射粒子对波激发和粒子加热的相对作用的试验台。
The Moon drives observable perturbations in the upstream solar wind in a similar manner to the terrestrial foreshock. Recent observations suggested that lunar dayside electrostatic waves can arise from two different driving mechanisms, both involving reflected particles from lunar crustal magnetic fields. However, their association with the global distribution of lunar magnetic anomalies have not been fully characterized. Here we exploit polar orbiting Kaguya to generate first global maps of electrostatic waves and solar wind electron modification above the day side of the Moon. The maps clearly demonstrate that the two signatures are correlated with lunar crustal magnetic fields. Additionally, we observe different characteristics of electron modification for different interplanetary magnetic field orientations. The lunar crustal magnetic fields cause a wide range of reflected electron and ion intensities, thereby serving as a test bed to investigate the relative roles of reflected particles on wave excitation and particle heating.