Sources, transport, and distributions of plasma sheet ions and electrons and dependences on interplanetary parameters under northward interplanetary magnetic field

Chih-Ping Wang; Larry R. Lyons; Tsugunobu NagaiJames M. WeygandRichard W. McEntire

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Sources, transport, and distributions of plasma sheet ions and electrons and dependences on interplanetary parameters under northward interplanetary magnetic field

机译：来源、运输、和等离子体的分布离子和电子板和依赖性星际参数下向北行星际磁场

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We have investigated the Geotail data statistically to understand the particle sources, transport, and spatial distributions of the plasma sheet ions and electrons of different energies during northward interplanetary magnetic field (IMF), and their dependences on the solar wind density (N sw), the solar wind speed (V sw), and the magnitude of the northward IMF B z (∣B z,IMF∣). We find that the plasma sheet becomes colder and denser, indicating a larger increase in the cold than in the hot population, with increasing N sw or ∣B z,IMF∣ or with decreasing V sw. The cold population dominates the region near the flanks while the hot population dominates the near-midnight region, which is consistent with the plasma sheet plasma being a mixture of cold particles coming from the flanks and hot particles from the distant-tail. The phase space densities show that the flank source strongly depends on ∣B z,IMF∣, while the tail source strongly depends on V sw. Cold particles from the dawn flank to midnight increase significantly with decreasing V sw, but no significant changes are seen near the dusk flank, suggesting a dependence of the solar wind entry through the dawn flank on V sw. The comparisons between the distributions of the phase space density and the electric and magnetic drift paths estimated from the observations indicate that the thermal and high-energy particles are mainly transported by electric and magnetic drift, while other transport mechanisms, such as diffusion, may play a role in transporting the low energy particles from the flank sources to midnight.

机译：我们已经调查了Geotail数据统计理解粒子的来源,运输和空间分布的等离子体离子和电子的不同在向北行星际磁场能量字段(IMF),他们的依赖性在太阳能上风能密度(N sw),太阳风速度(V)西南,和国际货币基金组织向北的大小B z(∣Bz, IMF∣)。冷,密度更大,表明一个更大的提高冷的热的人口增加N sw或∣B z, IMF∣或减少V西南。侧翼,而热人口占主导地位临近午夜,这是一致的冷的等离子体片等离子体是一个混合物粒子来自侧翼和热从distant-tail粒子。密度强烈表明,侧面来源取决于∣B z, IMF∣,尾巴来源强烈依赖于V西南。黎明侧面午夜显著增加V sw下降,但无显著变化被附近的黄昏侧面,暗示通过依赖太阳风的条目黎明V西南侧。空间密度和分布的阶段电和磁漂移路径估计观察结果表明,热高能粒子主要是经由电和磁漂移,而其他传输机制,如扩散,可能会玩在运输的低能量粒子从侧面来源到午夜。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2007年第10期|A10224-1-A10224-12-0|共12页
作者
Chih-Ping Wang; Larry R. Lyons; Tsugunobu NagaiJames M. WeygandRichard W. McEntire;
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Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California, USA;

Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA;

Applied Physics Laboratory, Johns Hopkins University, Laurel, Maryland, USADepartment of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan;

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DEPENDENCE; space density; IonsCOLDparticle sourcestransportElectricitysolar windFlankCommon ColdINTERPLANETARY MAGNETIC FIELDSPLASMA SHEET;

机译：依赖;空间密度;IonsCOLDparticlesourcestransportElectricitysolar windFlankCommonColdINTERPLANETARY磁FIELDSPLASMA表;

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Sources, transport, and distributions of plasma sheet ions and electrons and dependences on interplanetary parameters under northward interplanetary magnetic field

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