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Upstream proton cyclotron waves: occurrence and amplitude dependence on IMF cone angle at Mars——from MAVEN observations

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Earth and Planetary Physics 2020年第1期4卷 51-61页

作者： Di Liu ZhongHua Yao Yong Wei ZhaoJin Rong LiCan Shan Stiepen Arnaud espley jared HanYing Wei WeiXing Wan Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Laboratoire de Physique Atmospherique et Planetaire STAR instituteUniversite de LiegeLiegeBelgium NASA Goddard Space Flight Center GreenbeltMarylandUSA Department of Earth Planetary and Space SciencesUniversity of CaliforniaLos AngelesCaliforniaUSA

Proton cyclotron waves(PCWs)can be generated by ion pickup of Martian exospheric particles in the solar *** solar wind ion pickup process is highly dependent on the“IMF cone angle”—the angle between the solar wind velocity and the interplanetary magnetic field(IMF),which also plays an important role in the generation of *** data from 2.15 Martian years of magnetic field measurements collected by the Mars Atmosphere and Volatile Evolution(MAVEN)mission,we have identified 3307 upstream PCW *** event number distribution decreases exponentially with their duration.A statistical investigation of the effects of IMF cone angle on the amplitudes and occurrence rates of PCWs reveals a slight tendency of PCWs’amplitudes to decrease with increasing IMF cone *** relationship between the amplitude and IMF cone angle is weak,with a correlation coefficient r=–*** also investigated the influence of IMF cone angle on the occurrence rate of PCWs and found that their occurrence rate is particularly high for intermediate IMF cone angles(~18°–42°)even though highly oblique IMF orientation occurs most frequently in the upstream region of the Martian bow *** also conclude that these variabilities are not artefacts of temporal coverage biases in MAVEN *** results demonstrate that whereas IMF cone angle strongly influences the occurrence of PCWs,IMF cone angle may also weakly modulate their amplitudes in the upstream region of Mars.

关键词： ion pickup proton cyclotron waves Martian exosphere

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