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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron temperature anisotropy associated to field-aligned currents in the Earth's magnetosphere inferred from Rosetta MIP-RPC observations during 2009 flyby
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Electron temperature anisotropy associated to field-aligned currents in the Earth's magnetosphere inferred from Rosetta MIP-RPC observations during 2009 flyby

机译：电子温度各向异性有关在地球的field-aligned电流磁气圈从罗塞塔MIP-RPC推断观察2009年飞越

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摘要

A new approach is proposed for data interpretation of the Mutual Impedance Probe (MIP) instrument from the Rosetta Plasma Consortium (RPC) during the 2009 Earth's flyby gravity assist through the magnetosphere, from dusk to dawn regions. The spacecraft trajectory of ±8 R_E (Earth's radius) was crossing several structures of field-aligned currents (FACs) and radiations belts on both legs of the closest approach (CA, 2.450 km altitude). As routinely revealed by several pioneering space missions, natural and forced electrostatic wave emissions called Fqs were observed over ±3 R_E at around CA using a dedicated mode of the MIP instrument. These emissions are lying between consecutive harmonics of the electroncyclotron frequency, and their wavelength is perpendicular to the magnetic field lines. Provided that the Fq's wavelengths projected along the MIP antenna might be estimated, it is shown that the local value of the Larmor radius can be deduced; hence, the electron temperature component perpendicular to the magnetic field is subsequently derived. On the other hand, during the time of Fq's observations, the presence of VLF hiss emissions usually observed in these regions gives us the possibility to determine the electron temperature anisotropy associated to the electrostatic electron anisotropy instability according to the theoretical model proposed by Gary and Cairns (JGR, vol. 104, 1999). Significant dynamic constraints revealed by crossing successive series of FACs tubes are shown being controlled by this anisotropy, and the fact that the magnetic pressure is significantly larger than the thermal pressure suggests that the FACs lobes are nonforce free. Plain Language Summary The prime significant point of this work is the first attempt to derive the perpendicular electron temperature component versus the magnetic field by using the Bernstein's Fq's modes properties. Complementary data returns, such as determination of the Beta ratio electron temperature/magnetic pressure, bring new inputs to our understanding of the FACs tubes dynamic confinement. The new approach proposed in this work for the treatment of Fq's resonances appears promising to be implemented for further space missions in magnetized plasmas of the planets in the solar system, in order to determinate the electron temperature perpendicular component, to reveal the possible existence of an electron temperature anisotropy and thus the force ratio between the two components of electron and magnetic thermal pressures.
机译：提出了一种新的方法对数据的解释的互阻抗探针(MIP)工具罗塞塔的等离子体联盟(RPC)2009年的地球的飞越重力帮助通过磁气圈,从黄昏到黎明的地区。航天器轨道±8 R_E(地球半径)正穿过几field-aligned结构电流(流式细胞仪)和辐射带两条腿最近的方法(CA, 2.450公里高度)。经常透露几个开拓空间任务,自然和强制静电波排放叫fq±3 R_E观察在CA MIP的使用一个专用的模式乐器。连续electroncyclotron的谐波频率,波长是垂直的磁场线。沿着MIP天线Fq波长的投射可能估计,结果表明,当地的拉莫尔半径值可以推导出;电子温度组件垂直随后的磁场。另一方面,Fq的期间观察,甚低频嘶嘶声排放的存在通常在这些区域使我们观察到可能性来确定电子温度各向异性有关静电电子显示各向异性不稳定加里和凯恩斯提出的理论模型(JGR卷。104年,1999年)。限制显示连续跨越一系列的流式细胞仪管显示被控制通过这种各向异性,这一事实磁压力明显大于热压力显示,流式细胞仪叶nonforce有空。主要工作是第一的重要点试图推导出垂直电子温度分量和磁场通过使用伯恩斯坦Fq的模式属性。补充数据返回,如决心β系数的电子温度/磁压力,为我们的理解带来新的输入流式细胞仪的动态约束管。方法提出了治疗工作Fq共振出现的承诺为进一步实现太空任务磁化等离子体的太阳的行星电子系统,以确定温度垂直分量,揭示可能存在的电子温度各向异性,因此力之间的比例两个组件的电子和磁热压力。

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