Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results
Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results
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DOI：
10.1186/s40623-017-0760-x
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发表时间：
2017-12-27
影响因子：
3
通讯作者：
Nomura, Reiko
中科院分区：
文献类型：
--
作者：
Kasaba, Yasumasa;Ishisaka, Keigo;Nomura, Reiko
本文总结了“晓”（ERG）卫星上等离子体波实验（PWE）电场测量的关键部件——线探针天线（WPT）和电场探测器（EFD）的规格及初步评估结果。WPT由两对偶极子天线组成，端到端长度约为31米。每个天线单元在导线（长15米）的两端各有一个球形探头（直径60毫米）。它们在航天器的自旋平面内正交伸展，该平面大致垂直于太阳，能够测量直流到10兆赫频率范围内的电场。该系统与贝皮·科伦坡水星磁层轨道器上的等离子体波探测器的线探针天线几乎相同，只是球形探头的材料不同（“晓”：铝合金，贝皮·科伦坡：钛合金）。EFD是EWO（EFD/WFC/OFA）接收器的一部分，它以512赫兹的采样率测量2通道电场（动态范围：±200毫伏/米），并以128赫兹的采样率测量4通道航天器电位（动态范围：±100伏和±3伏/米），同时具备对WPT的偏置控制能力。电场波形提供（1）有关等离子体动力学和加速度的基本信息，以及（2）在各种磁层状态下，结合由MGF和PWE - MSC测量的磁场得到的磁流体动力学（MHD）波和离子波的特征。航天器电位结合由PWE - HFA提供的上混合共振频率所获得的电子密度，提供了热电子等离子体变化和结构的信息。EFD有两种数据模式。连续（中模式）数据提供为（1）64赫兹（在远心点模式，L>4）或256赫兹（在近心点模式，L<4）的2通道波形，（2）1 - 232赫兹范围内、分辨率为1秒的1通道频谱，以及（3）8赫兹的4通道航天器电位。突发（高模式）数据是间歇性获取的，包括（4）512赫兹的2通道波形和（5）128赫兹的4通道航天器电位，并在选择后与WFC - E/B数据集一起下载。本文还展示了初始观测阶段的初步评估结果。
This paper summarizes the specifications and initial evaluation results of Wire Probe Antenna (WPT) and Electric Field Detector (EFD), the key components for the electric field measurement of the Plasma Wave Experiment (PWE) aboard the Arase (ERG) satellite. WPT consists of two pairs of dipole antennas with similar to 31-m tip-to-tip length. Each antenna element has a spherical probe (60 mm diameter) at each end of the wire (15 m length). They are extended orthogonally in the spin plane of the spacecraft, which is roughly perpendicular to the Sun and enables to measure the electric field in the frequency range of DC to 10 MHz. This system is almost identical to the WPT of Plasma Wave Investigation aboard the BepiColombo Mercury Magnetospheric Orbiter, except for the material of the spherical probe (ERG: Al alloy, MMO: Ti alloy). EFD is a part of the EWO (EFD/WFC/OFA) receiver and measures the 2-ch electric field at a sampling rate of 512 Hz (dynamic range: +/- 200 mV/m) and the 4-ch spacecraft potential at a sampling rate of 128 Hz (dynamic range: +/- 100 V and +/- 3 V/m), with the bias control capability of WPT. The electric field waveform provides (1) fundamental information about the plasma dynamics and accelerations and (2) the characteristics of MHD and ion waves in various magnetospheric statuses with the magnetic field measured by MGF and PWE-MSC. The spacecraft potential provides information on thermal electron plasma variations and structure combined with the electron density obtained from the upper hybrid resonance frequency provided by PWE-HFA. EFD has two data modes. The continuous (medium-mode) data are provided as (1) 2-ch waveforms at 64 Hz (in apoapsis mode, L > 4) or 256 Hz (in periapsis mode, L < 4), (2) 1-ch spectrum within 1-232 Hz with 1-s resolution, and (3) 4-ch spacecraft potential at 8 Hz. The burst (high-mode) data are intermittently obtained as (4) 2-ch waveforms at 512 Hz and (5) 4-ch spacecraft potential at 128 Hz and downloaded with the WFC-E/B datasets after the selection. This paper also shows the initial evaluation results in the initial observation phase.