THE ELECTRIC FIELD AND WAVE EXPERIMENT FOR THE CLUSTER MISSION
THE ELECTRIC FIELD AND WAVE EXPERIMENT FOR THE CLUSTER MISSION
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DOI：
10.1023/a:1004975108657
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发表时间：
1997
影响因子：
10.3
通讯作者：
Georg Gustafsson;R. Boström;B. Holback;G. Holmgren;A. Lundgren;Krzysztof Stasiewicz;L. Åhlén;
中科院分区：
文献类型：
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作者：
Georg Gustafsson;R. Boström;B. Holback;G. Holmgren;A. Lundgren;Krzysztof Stasiewicz;L. Åhlén;
基于原子团的电场和波动实验（EFW）是为了测量原子团的电场和密度涨落而设计的，采样率高达36000个样本s-1。也可以进行朗缪尔探针扫描以确定电子密度和温度。该仪器有几个重要的功能。这些技术包括：（1）以高幅度和时间分辨率测量幅度高达700 mV m-1的准静态电场;（2）在短时间内测量多达5个同时波形（来自搜索线圈磁力计传感器的两个电信号和三个磁信号）具有高时间分辨率的4kHz带宽，（3）高时间分辨率的四点密度涨落测量。该实验更有趣的科学目标之一是研究导致等离子体加速的非线性波现象以及大尺度和小尺度干涉测量。通过使用四个航天器进行大尺度差分测量，并在一个航天器上使用几个朗缪尔探测器进行小尺度干涉测量，将有可能在广泛的空间和时间尺度上研究等离子体结构的运动和形状。本文介绍了EFW实验的主要科学目标和仪器的技术性能。
The electric-field and wave experiment (EFW) on Cluster is designed to measure the electric-field and density fluctuations with sampling rates up to 36000 samples s-1. Langmuir probe sweeps can also be made to determine the electron density and temperature. The instrument has several important capabilities. These include (1) measurements of quasi-static electric fields of amplitudes up to 700 mV m-1with high amplitude and time resolution, (2) measurements over short periods of time of up to five simualtaneous waveforms (two electric signals and three magnetic signals from the seach coil magnetometer sensors) of a bandwidth of 4 kHz with high time resolution, (3) measurements of density fluctuations in four points with high time resolution. Among the more interesting scientific objectives of the experiment are studies of nonlinear wave phenomena that result in acceleration of plasma as well as large- and small-scale interferometric measurements. By using four spacecraft for large-scale differential measurements and several Langmuir probes on one spacecraft for small-scale interferometry, it will be possible to study motion and shape of plasma structures on a wide range of spatial and temporal scales. This paper describes the primary scientific objectives of the EFW experiment and the technical capabilities of the instrument.