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ion pickup by intrinsic low-frequency Alfvén waves with a spectrum

Chinese Physics B 2009年第5期18卷 2101-2108页

作者：陆全明李醒董川飞 School of Earth and Space Sciences University of Science and Technology of China State Key Laboratory of Space Weather Chinese Academy of Sciences Institute of Mathematical and Physical Sciences Aberystwyth UniversityAberystwythSY23 2BZUK

ion pickup by a monochromatic low-frequency Alfv6n wave, which propagates along the background magnetic field, has recently been investigated in a low beta plasma （Lu and Li 2007 Phys. Plasmas 14 042303）. In this paper, the monochromatic Alfven wave is generalized to a spectrum of Alfven waves with random phase. It finds that the process of ion pickup can be divided into two stages. First, ions are picked up in the transverse direction, and then phase difference （randomization） between ions due to their different parallel thermal motions leads to heating of the ions. The heating is dominant in the direction perpendicular to the background magnetic field. The temperatures of the ions at the asymptotic stage do not depend on individual waves in the spectrum, but are determined by the total amplitude of the waves. The effect of the initial ion bulk flow in the parallel direction on the heating is also considered in this paper.

关键词： ion pickup Alfven wave ion heating temperature anisotropy

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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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