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A case study of large-amplitude ULF waves in the Martian foreshock

查看全文 作　　者：LiCan [1,2]Shan;YaSong [1,2,3]Ge;AiMin [1,2,3]Du 高影响力作者 机构地区：[1]Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;[2]Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China;[3]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China高影响力机构 出　　处：《Earth and Planetary Physics》索引2020年第4卷第1期,共6页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China (2016YFB0501300, 2016YFB0501304);the National Natural Science Foundation of China (Grants No.41774187, 41674168, 41774176);Beijing Municipal Science and Technology Commission (Grant No.Z191100004319001);the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDA14040404);the pre-research Project on Civil Aerospace Technologies No.D020103 funded by CNSA 摘　　要：Foreshock ultralow frequency (ULF) waves constitute a significant physical phenomenon in the plasma environment of terrestrial planets. The occurrence of these waves, associated with backstreaming particles reflected and accelerated at the bow shock, implies specific conditions and properties of the shock and its foreshock. Using magnetic field and ion measurements from MAVEN, we report a clear event of ULF waves in the Martian foreshock. The interplanetary magnetic field connected to the Martian bow shock, forming a shock angle of ~51°. Indicating that this was a fast mode wave is the fact that ion density varied in phase with perturbations of the wave field. The peak frequency of the waves was about 0.040 Hz in the spacecraft frame, much lower than the local proton gyrofrequency (~0.088 Hz). The ULF waves had a propagation angle approximately 34° from ambient magnetic field and were accompanied by the whistler mode. The ULF waves displayed left-hand elliptical polarization with respect to the interplanetary magnetic field in the spacecraft frame. All these properties fit very well with foreshock waves excited by interactions between solar wind and backstreaming ions through right-hand beam instability. 关 键 词：foreshock ULF waves Martian bow shock backstreaming ions
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