[P-EM15] Space Plasma Physics: Theory and Simulation

[PEM15-12] Spin-modulated components in Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite

*Satoko Nakamura¹, Yoshizumi Miyoshi¹, Yasumasa Kasaba², Tomoko Nakagawa³, Tomoaki Hori¹, Shoya Matsuda⁴, Masafumi Shoji¹, Atsushi Kumamoto⁷, Fuminori Tsuchiya², Ayako Matsuoka⁵, Yoshiya Kasahara⁶ (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Planetary Plasma and Atmospheric Research Center, Tohoku University, 3.Information and Communication Engineering, Tohoku Institute of Technology, 4.Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency, 5.Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, 6.Information Media Center, Kanazawa University, 7.Department of Geophysics, Graduate School of Science, Tohoku University)

Keywords:Arase satellite, Electric field

The 8-Hz potential data measured by the electric field detector (EFD) on board the Arase satellite show spin-modulated distortions from sinusoidal signals due to spin motions. We analyze the influence of these distortions in measurements of DC field in the Earth's magnetosphere. The Arase satellite orbits the altitudes from the perigee of 460 km to the apogee of 32,000 with the inclination of 31°. Statistical data analysis shows asymmetries and pulsations of the probe potential surrounding the spacecraft to the spin axis.
The distortions cause miscalculations of DC- or low frequency electric fields in both the amplitudes and directions.