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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Influence of the Ambient Electric Field on Measurements of the Actively Controlled Spacecraft Potential by MMS
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Influence of the Ambient Electric Field on Measurements of the Actively Controlled Spacecraft Potential by MMS

机译：周围电场的影响主动控制的测量航天器可能通过彩信功能

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Space missions with sophisticated plasma instrumentation such as Magnetospheric Multiscale,which employs four satellites to explore near-Earth space benefit from a low electric potential of the spacecraft, to improve the plasma measurements and therefore carry instruments to actively control the potential by means of ion beams. Without control, the potential varies in anticorrelation with plasma density and temperature to maintain an equilibrium between the plasma current and the one of photoelectrons produced at the surface and overcoming the potential barrier. A drawback of the controlled, almost constant potential is the difficulty to use it as convenient estimator for plasma density. This paper identifies a correlation between the spacecraft potential and the ambient electric field, both measured by double probes mounted at the end of wire booms, as the main responsible for artifacts in the potential data besides the known effect of the variable photoelectron production due to changing illumination of the surface. It is shown that the effect of density variations is too weak to explain the observed correlation with the electric field and that a correction of the artifacts can be achieved to enable the reconstruction of the uncontrolled potential and plasma density in turn. Two possible mechanisms are discussed: the asymmetry of the current-voltage characteristic determining the probe to plasma potential and the fact that a large equipotential structure embedded in an electric field results in asymmetries of both the emission and spatial distribution of photoelectrons, which results in an increase of the spacecraft potential.
机译：太空任务和复杂的等离子体仪表等磁性层的多尺度,采用四个卫星探索受益于较低的近地空间宇宙飞船的电势,改善等离子体测量,因此携带积极控制潜在的工具离子光束的方法。潜在的变化与等离子体anticorrelation密度和温度保持一个等离子体电流和平衡一个表面,产生的光电子克服势垒。控制,几乎恒定的潜力使用它作为方便估计困难等离子体密度。宇宙飞船的潜力和之间的相关性衡量周围的电场双探针安装在电线的繁荣,主要负责工件潜在的数据除了已知的的影响由于改变变量光电子产品照明的表面。密度变化的影响太弱解释观察到的相关性的电场的校正工件可以使实现重建的不受控制的潜力和等离子体密度。讨论:不对称的电流电压特性决定探针等离子潜力,这一事实嵌入在一个大型等位结构电场导致不对称的排放和空间分布光电子,导致增加了宇宙飞船的潜力。

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