Diffuse Whistler‐Mode Waves Detected by Kaguya in the Lunar Polar Region
Diffuse Whistler‐Mode Waves Detected by Kaguya in the Lunar Polar Region
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辉夜号在月球极地地区探测到的弥散惠斯勒模式波
DOI：
10.1029/2021rs007369
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发表时间：
2022
期刊：
影响因子：
1.6
通讯作者：
Saito Y.
中科院分区：
文献类型：
--
作者：
Nakagawa T.;Takahashi F.;Shimizu H.;Saito Y.
月球磁场反射的太阳风粒子是电磁波活动的主要能量来源，如质子产生的100 s磁流体动力学波和1Hz哨声波以及镜面反射电子产生的非单色哨声波。Kaguya在月球极地地区上方100公里的高度发现了一种新型的哨声波，其频率范围为1-16 Hz。这些波在时域和频域上都是扩散的，它们的出现对月球表面的磁连接不太敏感。极化相对于背景磁场是右手的，波数矢量几乎平行于垂直于太阳风流动的磁场。扩散波被认为是由太阳风离子通过回旋共振被月球磁场反射而产生的。共振离子的速度分量平行于磁场，大于太阳风的整体速度;然而，这类离子并不总是同时被辉夜探测到。这些波可能是在月球的向阳面上方产生的，然后沿着被太阳风对流的磁场传播，到达极区，被月亮女神探测到。
The solar wind particles reflected by the lunar magnetic field are the major energy source of electromagnetic wave activities, such as the 100s magnetohydrodynamic waves and the 1Hz whistler-mode waves generated by protons and the non-monochromatic whistler-mode waves generated by mirror-reflected electrons. Kaguya found a new type of whistler-mode waves at 100 km altitude above the polar regions of the Moon with a broad frequency range of 1–16 Hz. The waves appear diffuse in both the time and frequency domains, and their occurrence is less sensitive to the magnetic connection to the lunar surface. The polarization is right-handed with respect to the background magnetic field, and the wave number vector is nearly parallel to the magnetic field perpendicular to the solar wind flow. The diffuse waves are thought to be generated by the solar wind ions reflected by the lunar magnetic field through cyclotron resonance. The resonant ions are expected to have a velocity component parallel to the magnetic field larger than the solar wind bulk speed; however, such ions were not always simultaneously detected by Kaguya. The waves may have been generated above the dayside of the Moon and then propagated along the magnetic field being convected by the solar wind to reach the polar regions to be detected by Kaguya.
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