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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron density estimations derived from spacecraft potential measurements on Cluster in tenuous plasma regions
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Electron density estimations derived from spacecraft potential measurements on Cluster in tenuous plasma regions

机译：电子密度估计值来自于在脆弱等离子体区域中的星团上的航天器电势测量

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摘要

Spacecraft potential measurements by the EFW electric field experiment on the Cluster satellites can be used to obtain plasma density estimates in regions barely accessible to other type of plasma experiments. Direct calibrations of the plasma density as a function of the measured potential difference between the spacecraft and the probes can be carried out in the solar wind, the magnetosheath, and the plasmashere by the use of CIS ion density and WHISPER electron density measurements. The spacecraft photoelectron characteristic (photoelectrons escaping to the plasma in current balance with collected ambient electrons) can be calculated from knowledge of the electron current to the spacecraft based on plasma density and electron temperature data from the above mentioned experiments and can be extended to more positive spacecraft potentials by CIS ion and the PEACE electron experiments in the plasma sheet. This characteristic enables determination of the electron density as a function of spacecraft potential over the polar caps and in the lobes of the magnetosphere, regions where other experiments on Cluster have intrinsic limitations. Data from 2001 to 2006 reveal that the photoelectron characteristics of the Cluster spacecraft as well as the electric field probes vary with the solar cycle and solar activity. The consequences for plasma density measurements are addressed. Typical examples are presented to demonstrate the use of this technique in a polar cap/lobe plasma.
机译：在簇状卫星上通过EFW电场实验进行的航天器电势测量可用于获得其他类型的等离子体实验难以接近的区域中的等离子体密度估计。通过使用CIS离子密度和WHISPER电子密度测量，可以在太阳风，磁石场和等离子体中对作为在航天器和探测器之间测得的电位差的函数的等离子体密度进行直接校准。航天器的光电子特性（与收集的周围电子在电流平衡下逃逸到等离子体中的光电子）可以根据上述实验的等离子体密度和电子温度数据，根据航天器的电子电流知识来计算，并可以扩展到更正的等离子片中通过CIS离子和PEACE电子进行的航天器电势实验。该特性使得能够确定电子密度与航天器在极帽和磁层瓣上的电势之间的函数关系，在这些区域上，簇上的其他实验具有固有的局限性。 2001年至2006年的数据表明，星团飞船的光电子特性以及电场探测器随太阳周期和太阳活动而变化。解决了等离子体密度测量的后果。给出了典型示例，以证明该技术在极性帽/瓣等离子体中的使用。

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