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Geospace Exploration by the ERG mission

The ERG project (Exploration of energization and Radiation in Geospace) is a geospace exploration project to elucidate acceleration, transportation and loss of energetic electrons in the radiation belts and dynamics of geospace storms. The projects consist of JAXA’s satellite mission, ground-based observations and simulation and modeling studies and provide a comprehensive picture of dynamical evolutions of the inner magnetosphere. The ERG project contributes to the international fleet of geospace satellites as well as ground-based network observations, which realize multi point observations in geospace. The ERG satellite will be launched in FY 2016, and initial observation data will arrive after the launch.

This special issue focuses on all science instruments of the ERG satellite and their initial results. The issue includes the papers on the satellite systems and also focuses on overview of the ground-based observations, simulation studies, and science center activities of the ERG project.

Edited by: Tsugunobu Nagai, Barry Mauk, Ondrej Santolik, Takashi Kubota, Takeshi Sakanoi

  1. Full paper

    Theory, modeling, and integrated studies in the Arase (ERG) project

    Understanding of underlying mechanisms of drastic variations of the near-Earth space (geospace) is one of the current focuses of the magnetospheric physics. The science target of the geospace research project ...

    Kanako Seki, Yoshizumi Miyoshi, Yusuke Ebihara, Yuto Katoh, Takanobu Amano, Shinji Saito, Masafumi Shoji, Aoi Nakamizo, Kunihiro Keika, Tomoaki Hori, Shin’ya Nakano, Shigeto Watanabe, Kei Kamiya, Naoko Takahashi, Yoshiharu Omura, Masahito Nose…

    Earth, Planets and Space 2018 70:17

    Published on: 1 February 2018

  2. Full paper

    Software-type Wave–Particle Interaction Analyzer on board the Arase satellite

    We describe the principles of the Wave–Particle Interaction Analyzer (WPIA) and the implementation of the Software-type WPIA (S-WPIA) on the Arase satellite. The WPIA is a new type of instrument for the direct...

    Yuto Katoh, Hirotsugu Kojima, Mitsuru Hikishima, Takeshi Takashima, Kazushi Asamura, Yoshizumi Miyoshi, Yoshiya Kasahara, Satoshi Kasahara, Takefumi Mitani, Nana Higashio, Ayako Matsuoka, Mitsunori Ozaki, Satoshi Yagitani, Shoichiro Yokota, Shoya Matsuda, Masahiro Kitahara…

    Earth, Planets and Space 2018 70:4

    Published on: 8 January 2018

  3. Full paper

    Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite: specifications and initial evaluation results

    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 E...

    Yasumasa Kasaba, Keigo Ishisaka, Yoshiya Kasahara, Tomohiko Imachi, Satoshi Yagitani, Hirotsugu Kojima, Shoya Matsuda, Masafumi Shoji, Satoshi Kurita, Tomoaki Hori, Atsuki Shinbori, Mariko Teramoto, Yoshizumi Miyoshi, Tomoko Nakagawa, Naoko Takahashi, Yukitoshi Nishimura…

    Earth, Planets and Space 2017 69:174

    Published on: 27 December 2017

  4. Full paper

    Medium-energy particle experiments–ion mass analyzer (MEP-i) onboard ERG (Arase)

    The medium-energy particle experiments–ion mass analyzer (MEP-i) was developed for the exploration of energization and radiation in geospace (ERG) mission (Arase), in order to measure the three-dimensional dis...

    Shoichiro Yokota, Satoshi Kasahara, Takefumi Mitani, Kazushi Asamura, Masafumi Hirahara, Takeshi Takashima, Kazuhiro Yamamoto and Yasuko Shibano

    Earth, Planets and Space 2017 69:172

    Published on: 21 December 2017

  5. Technical report

    Visualization tool for three-dimensional plasma velocity distributions (ISEE_3D) as a plug-in for SPEDAS

    This paper introduces ISEE_3D, an interactive visualization tool for three-dimensional plasma velocity distribution functions, developed by the Institute for Space-Earth Environmental Research, Nagoya Universi...

    Kunihiro Keika, Yoshizumi Miyoshi, Shinobu Machida, Akimasa Ieda, Kanako Seki, Tomoaki Hori, Yukinaga Miyashita, Masafumi Shoji, Iku Shinohara, Vassilis Angelopoulos, Jim W. Lewis and Aaron Flores

    Earth, Planets and Space 2017 69:170

    Published on: 21 December 2017

  6. Full paper

    Low-energy particle experiments–electron analyzer (LEPe) onboard the Arase spacecraft

    In this report, we describe the low-energy electron instrument LEPe (low-energy particle experiments–electron analyzer) onboard the Arase (ERG) spacecraft. The instrument measures a three-dimensional distribut...

    Yoichi Kazama, Bo-Jhou Wang, Shiang-Yu Wang, Paul T. P. Ho, Sunny W. Y. Tam, Tzu-Fang Chang, Chih-Yu Chiang and Kazushi Asamura

    Earth, Planets and Space 2017 69:165

    Published on: 11 December 2017

  7. Full paper

    Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network

    The plasmas (electrons and ions) in the inner magnetosphere have wide energy ranges from electron volts to mega-electron volts (MeV). These plasmas rotate around the Earth longitudinally due to the gradient an...

    Kazuo Shiokawa, Yasuo Katoh, Yoshiyuki Hamaguchi, Yuka Yamamoto, Takumi Adachi, Mitsunori Ozaki, Shin-Ichiro Oyama, Masahito Nosé, Tsutomu Nagatsuma, Yoshimasa Tanaka, Yuichi Otsuka, Yoshizumi Miyoshi, Ryuho Kataoka, Yuki Takagi, Yuhei Takeshita, Atsuki Shinbori…

    Earth, Planets and Space 2017 69:160

    Published on: 28 November 2017