The FIELDS Instrument Suite on MMS: Scientific Objectives, Measurements, and Data Products
The FIELDS Instrument Suite on MMS: Scientific Objectives, Measurements, and Data Products
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DOI：
10.1007/s11214-014-0109-8
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发表时间：
2016-03
影响因子：
10.3
通讯作者：
R. Torbert;C. Russell;W. Magnes;R. Ergun;P. Lindqvist;O. Lecontel;H. Vaith;J. Macri;S. Myers-S.
中科院分区：
文献类型：
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作者：
R. Torbert;C. Russell;W. Magnes;R. Ergun;P. Lindqvist;O. Lecontel;H. Vaith;J. Macri;S. Myers-S.
磁层多尺度（MMS）使命上的FIELDS仪器套件提供了对MMS所研究的重联区域中的全矢量磁场和电场的全面测量，包括日侧磁层顶和夜侧磁尾加速区域，最高可达25 Re。四个MMS航天器中的每一个上的六个传感器在发射之前和之后提供对这些场的重叠测量，并进行灵敏的交叉校准。FIELDS磁传感器包括频率范围从DC到64 Hz的冗余磁通门磁力计（AFG和DFG），一个搜索线圈磁力计（SCM），提供预计在MMS上看到的全哨声模式频谱的AC测量，以及一个校准磁力计偏移的电子漂移仪（EDI）。FIELDS三轴电场测量由两组偏置双探头传感器（SDP和ADP）提供，它们在高度对称的航天器环境中工作，以显著减少静电误差。这些传感器与EDI电子测量相配合，不受任何当地航天器扰动的影响。交叉校准的矢量电场测量，从而产生从DC到100 kHz，远远超出了上混合谐振，其频率提供了一个精确的确定的本地电子密度。由于其非常大的几何因子，EDI还提供了非常高的时间分辨率（101 ms）的环境电子通量测量在几个选定的能量接近1 keV。本文概述了FIELDS套件，其科学目标和测量要求，以及在校准和交叉校准程序中验证的性能，这些校准和交叉校准程序导致预期误差小于0.1 nT inBand 0.5 mV/m inE。还描述了从FIELDS产生的数据产品的摘要，以及用于交叉校准的算法。AFG/DFG、SCM、ADP、SDP和EDI的设计和性能特性的详细信息在五篇配套论文中提供。
The FIELDS instrumentation suite on the Magnetospheric Multiscale (MMS) mission provides comprehensive measurements of the full vector magnetic and electric fields in the reconnection regions investigated by MMS, including the dayside magnetopause and the night-side magnetotail acceleration regions out to 25 Re. Six sensors on each of the four MMS spacecraft provide overlapping measurements of these fields with sensitive cross-calibrations both before and after launch. The FIELDS magnetic sensors consist of redundant flux-gate magnetometers (AFG and DFG) over the frequency range from DC to 64 Hz, a search coil magnetometer (SCM) providing AC measurements over the full whistler mode spectrum expected to be seen on MMS, and an Electron Drift Instrument (EDI) that calibrates offsets for the magnetometers. The FIELDS three-axis electric field measurements are provided by two sets of biased double-probe sensors (SDP and ADP) operating in a highly symmetric spacecraft environment to reduce significantly electrostatic errors. These sensors are complemented with the EDI electric measurements that are free from all local spacecraft perturbations. Cross-calibrated vector electric field measurements are thus produced from DC to 100 kHz, well beyond the upper hybrid resonance whose frequency provides an accurate determination of the local electron density. Due to its very large geometric factor, EDI also provides very high time resolution (∼1 ms) ambient electron flux measurements at a few selected energies near 1 keV. This paper provides an overview of the FIELDS suite, its science objectives and measurement requirements, and its performance as verified in calibration and cross-calibration procedures that result in anticipated errors less than 0.1 nT inBand 0.5 mV/m inE. Summaries of data products that result from FIELDS are also described, as well as algorithms for cross-calibration. Details of the design and performance characteristics of AFG/DFG, SCM, ADP, SDP, and EDI are provided in five companion papers.