A Case Study of Nonresonant Mode 3‐s ULF Waves Observed by MMS
A Case Study of Nonresonant Mode 3‐s ULF Waves Observed by MMS
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MMS 观测非谐振模式 3 超低频波的案例研究
DOI:
10.1029/2020ja028557
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Giles, Barbara L.
中科院分区:
文献类型:
--
作者:
Wang, Shan;Chen, Li‐Jen;Ng, Jonathan;Bessho, Naoki;Le, Guan;Fung, Shing F.;Gershman, Daniel J.;Giles, Barbara L.
The nature of the 3‐s ultralow frequency (ULF) wave in the Earth's foreshock region and the associated wave‐particle interaction are not yet well understood. We investigate the 3‐s ULF waves using Magnetospheric Multiscale (MMS) observations. By combining the plasma rest frame wave properties obtained from multiple methods with the instability analysis based on the velocity distribution in the linear wave stage, the ULF wave is determined to be due to the ion/ion nonresonant mode instability. The interaction between the wave and ions is analyzed using the phase relationship between the transverse wave fields and ion velocities and using the longitudinal momentum equation. During the stage when ULF waves have sinusoidal waveforms up to |dB|/|B0| ~ 3, wheredBis the wave magnetic field andB0is the background magnetic field, the wave electric fields perpendicular toB0do negative work to solar wind ions; alongB0, a longitudinal electric field develops, but theV×Bforce is stronger and leads to solar wind ion deceleration. During the same wave stage, the backstreaming beam ions gain energy from the transverse wave fields and get deceleration alongB0by the longitudinal electric field. The ULF wave leads to electron heating, preferentially in the direction perpendicular to the local magnetic field. Secondary waves are generated within the ULF waveforms, including whistler waves near half of the electron cyclotron frequency, high‐frequency electrostatic waves, and magnetosonic whistler waves. The work improves the understanding of the nature of 3‐s ULF waves and the associated wave‐particle interaction.
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DOI:
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发表时间:
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期刊:
Journal of Geophysical Research: Space Physics
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