Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

Mon. May 21, 2018 1:45 PM - 3:15 PM 303 (3F International Conference Hall, Makuhari Messe)

convener:Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Keisuke Hosokawa(電気通信大学大学院情報理工学研究科, 共同), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Chairperson:Miyoshi Yoshizumi(ISEE, Nagoya University)

2:30 PM - 2:45 PM

[PEM16-10] Evaluation of the Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard ARASE: The data qualifications and cautions from the first-year observations

*Yasumasa Kasaba1, Masafumi Shoji2, Tomoko Nakagawa3, Tomoaki Hori2, Atsuki Shinbori2, Shoya Matsuda2, Yoshizumi Miyoshi2, Satoshi Kurita2, Mariko Teramoto2, Keigo Ishisaka4, Yoshiya Kasahara5, Satoshi Yagitani5, Hirotsugu Kojima6, Masahito Nose6, Yukitoshi Nishimura7, Naoko Takahashi8, Ayako Matsuoka9, Reiko Nomura9, Atsushi Kumamoto1, Fuminori Tsuchiya1, Hiroaki Misawa1 (1.Tohoku Univ., 2.ISEE, Nagoya Univ., 3.Tohoku Inst. Tech., 4.Toyama Pref. Univ., 5.Kanazawa Univ., 6.Kyoto Univ., 7.Boston Univ., 8.Univ. Tokyo, 9.JAXA)

Keywords:Arase (ERG), electric field, spacecraft potential

This paper shows the evaluation results of Wire Probe Antenna (WPT) and Electric Field Detector (EFD), which are one of the key parts of Plasma Wave Experiment (PWE) aboard the Arase (ERG) Satellite. The data qualifications and cautions from the first-year observations are shown for the scientists who expect to utilize this data sets.
WPT consists of the two sets of dipole antennas as electric field sensors with 32m tip-to-tip length, with a sphere probe (6cm diameter) attached at each end of wires (length: 15-m), extended orthogonally in the spin plane of the spacecraft which is roughly perpendicular to the Sun. WPT enables the PWE to measure the E-field in the frequency range from DC to 10 MHz. EFD is the 2-channel low frequency electric receiver as a part of EWO (EFD/WFC/OFA) and connected to the WPT for the measurement of 2ch electric field in the spin-plane with the sampling rate of 512 Hz (dynamic range: +-200 mV/m, +-3 V/m) and the 4ch spacecraft potential with the sampling rate of 128 Hz (dynamic range: +-100 V), respectively, with the the bias control capability for the WPT probes. The electric field in DC - 232Hz provides the capability to detect (1) the fundamental information of the plasma dynamics and accelerations and (2) the characteristics of MHD and ion waves with their Poynting vectors with the data measured by MGF and PWE/WFC-B connected to PWE/SCM (Search Coil Magnetometer) in stable and active magnetosopheric status. The spacecraft potential provides the basic electron density information with the upper hybrid resonance (UHR) frequency provided by PWE-HFA.
It is well known that the potential and electric field measureed by WPT and EFD has the tricky characteristics, which is common in the similar instruments aboard the MMS, Themis, and many previous spacecraft. In this paper, we summarize the status of their calibrations. Including the subtraction of spacecraft Velocity x B field, we introduce the potential problems for the data analyses of electric field in low frequency range caused by the effects of surrounding electron plasma characteristics on the spacecraft potential, wake effect caused by the spacecraft motions, and possible artificial contaminations, in order to support the fruitful scientific results from this valuable data sets with careful treatments.