The magnetic field investigation on the Arase (ERG) mission: Overview of initial scientific results

Tuesday, 6 March 2018
Lakehouse (Hotel Quinta da Marinha)
Ayako Matsuoka1, Mariko Teramoto2, Reiko Nomura3, Masahito Nose4, Akiko Fujimoto5, Yoshimasa Tanaka6, Manabu Shinohara7, Tsutomu Nagatsuma8, Kazuo Shiokawa9, Yuki Obana10, Yoshizumi Miyoshi2, Takeshi Takashima11 and Iku Shinohara1, (1)ISAS/JAXA, Sagamihara, Japan, (2)Nagoya University, Nagoya, Japan, (3)JAXA, Kanagawa, Japan, (4)Kyoto Univ, Graduate School of Science, Kyoto, Japan, (5)Kyushu University, International Center for Space Weather Science and Education, Fukuoka, Japan, (6)NIPR, Tokyo, Japan, (7)Kagoshima National College of, Kagoshima, Japan, (8)NICT National Institute of Information and Communications Technology, Tokyo, Japan, (9)Nagoya Univ, Aichi, Japan, (10)Osaka Electro-Communication University, Neyagawa, Japan, (11)ISAS Institute of Space and Astronautical Science, Kanagawa, Japan
Abstract:
Properties of the waves interacting with plasma and field line deformation by electric currents are leading subjects in the inner magnetosphere. By observing temporal field variations accurately, we are expecting to more deeply understand the MHD and EMIC waves of ULF frequency range, which have potential to cause the production and loss of the relativistic electrons and the ring-current particles. The rapid deformation of the magnetosphere, accompanied by the bursty plasma flux, is important to understand the energy flow in the inner magnetosphere. To study these phenomena, precise measurement of the magnetic field vectors is essential.
Data from the fluxgate magnetometer (MGF) onboard Arase (ERG) have shown various specific phenomena to the inner magnetosphere. The polarity of the Pc 3-5 ULF waves may be precisely determined by the accurate alignment calibration of the data. It would enables us to see the global structure of the magnetospheric oscillation. The original sampling frequency of MGF is 256Hz, and EMIC waves are found at altitudes from the perigee (440 km) to the apogee (32,000 km), at various magnetic field intensities. The dipolarization and associated waves are observed at substorm events. The accurate measurement of the magnetic field makes it possible to estimate the intensity of the electric current and its temporal variation.
In this talk the superiority of the magnetic field measurement by Arase and initial scientific results are presented.
<< Previous Abstract | Next Abstract >>