Systematic measurements of ion-proton differential streaming in the solar wind.
Systematic measurements of ion-proton differential streaming in the solar wind.
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DOI：
10.1103/physrevlett.106.151103
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发表时间：
2011-04
影响因子：
8.6
通讯作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler
中科院分区：
文献类型：
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作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler
高度稀薄的太阳风中的少量重离子是等离子体物理过程的敏感示踪剂，通常无法在实验室中获得。我们分析了1au时太阳风中重离子和质子之间的差异流。利用先进成分探测器上的太阳风电子质子α监测器和磁力计的三维速度矢量和磁场测量数据，重建了12 min 1D太阳风离子成分谱仪观测的离子质子差矢量v(ip) = v(i) - v(p)。我们发现，所有44个被分析的重离子沿行星际磁场流动的速度都小于，但与当地的alfvsamn速度C(A)相当。44种离子中有35种的流速在±0.15C(A) ~ He（2+）的流速0.55C(A)之间。
The small amount of heavy ions in the highly rarefied solar wind are sensitive tracers for plasma-physics processes, which are usually not accessible in the laboratory. We have analyzed differential streaming between heavy ions and protons in the solar wind at 1 AU. 3D velocity vector and magnetic field measurements from the Solar Wind Electron Proton Alpha Monitor and the Magnetometer aboard the Advanced Composition Explorer were used to reconstruct the ion-proton difference vector v(ip) = v(i) - v(p) from the 12 min 1D Solar Wind Ion Composition Spectrometer observations. We find that all 44 analyzed heavy ions flow along the interplanetary magnetic field at velocities which are smaller than, but comparable to, the local Alfvén speed C(A). The flow speeds of 35 of the 44 ion species lie within the range of ±0.15C(A) around 0.55C(A), the flow speed of He(2+).