A Merged Search‐Coil and Fluxgate Magnetometer Data Product for Parker Solar Probe FIELDS
A Merged Search‐Coil and Fluxgate Magnetometer Data Product for Parker Solar Probe FIELDS
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DOI：
10.1029/2020ja027813
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发表时间：
2020-01
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通讯作者：
T. Bowen;S. Bale;J. Bonnell;T. D. D. Wit-T.-D.-D.-Wit-144094338;K. Goetz;K. Goodrich;J. Gruesbeck;P. Harvey;G. Jannet
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作者：
T. Bowen;S. Bale;J. Bonnell;T. D. D. Wit-T.-D.-D.-Wit-144094338;K. Goetz;K. Goodrich;J. Gruesbeck;P. Harvey;G. Jannet
美国宇航局的帕克太阳探测器（PSP）任务目前正在使用原位和遥感仪器调查内日球层（<0.25 R⊙）的局部等离子体环境。将微物理粒子加热和加速过程的特征与宏观日球层结构联系起来，需要在大范围物理尺度上对电磁场进行敏感测量。FIELDS仪器为PSP提供了内日球层和日冕电磁场的原位测量，包括一组三个矢量磁强计：两个磁通门磁强计（MAGs）和一个电感耦合搜索线圈磁强计（SCM）。三个FIELDS磁力计一起可以测量本地磁场，带宽范围从直流到1mhz。本文报告了结合SCM和MAG （SCaM）测量的合并数据集的开发，从而实现具有最佳信噪比的高保真数据产品。讨论了复杂仪器响应和噪声底的地面表征测试以及在飞行中校准FIELDS数据的应用。提出了一种用于PSP/FIELDS的算法，用于合并来自多个具有最佳信噪特性的传感器的波形观测值。对校准和合并算法性能的飞行分析表明，定时精度在调查速率采样周期内达到~ 340 μs。
NASA's Parker Solar Probe (PSP) mission is currently investigating the local plasma environment of the inner heliosphere (<0.25 R⊙) using both in situ and remote sensing instrumentation. Connecting signatures of microphysical particle heating and acceleration processes to macroscale heliospheric structure requires sensitive measurements of electromagnetic fields over a large range of physical scales. The FIELDS instrument, which provides PSP with in situ measurements of electromagnetic fields of the inner heliosphere and corona, includes a set of three vector magnetometers: two fluxgate magnetometers (MAGs) and a single inductively coupled search‐coil magnetometer (SCM). Together, the three FIELDS magnetometers enable measurements of the local magnetic field with a bandwidth ranging from DC to 1 MHz. This manuscript reports on the development of a merged data set combining SCM and MAG (SCaM) measurements, enabling a high fidelity data product with an optimal signal‐to‐noise ratio. On‐ground characterization tests of complex instrumental responses and noise floors are discussed as well as application to the in‐flight calibration of FIELDS data. The algorithm used on PSP/FIELDS to merge waveform observations from multiple sensors with optimal signal‐to‐noise characteristics is presented. In‐flight analysis of calibrations and merging algorithm performance demonstrates a timing accuracy to well within the survey rate sample period of ∼340 μs.