The acceleration and loss mechanisms of outer belt particles as well as dynamic evolution of space storms have not been well understood yet in the context of cross-energy and cross-regional coupling. Comprehensive observations of plasma/particles in a
wide energy range and electric and magnetic fields in a wide frequency range are essential for the understanding of cross-energy coupling. Complementing satellite observations with ground-based network observations are necessary
for the understanding of cross-regional coupling.
The ERG project has been designed to closely collaborate satellite observations with ground-based observations and simulations and resolve the issues. Namely, the ERG project is organized into the following teams: the
satellite observation team, the ground-based network observation team, and the integrated data analysis/simulation team (Figure 1). The science coordination team and the science center also work with project management. About
100 researchers from about 30 Japanese and overseas institutes/universities participate in the ERG project.
ERG Satellite Observation Team
ERG Satellite Observation Team
Project Manager: Iku Shinohara (JAXA)
Mission Manager: Takeshi Takashima (JAXA)
Mission Submanager: Kazushi Asamura (JAXA)
Project Scientist: Yoshizumi Miyoshi (ISEE, Nagoya University)
Multipoint ground-based network observations act as complement to in situ satellite observations. Several networks of SuperDARN HF radars, fluxgate and induction magnetometers, airglow/aurora imagers, riometers, VLF/ELF receivers,
and standard LF wave receivers take part in the ERG project. These ground-based observations can provide the global state of the electric potential, the magnetic field, the current
system, particle precipitation, and ULF/ELF/VLF wave activities during space storms. For example, single spacecraft observations cannot determine the spatial distribution of the electric field, but HF radar observations
help to resolve the global evolution of the electric fields of both convection and MHD waves.
Integrated analyses of many types of data from both satellite and ground-based observations are crucial for the quantitative understanding of the physical processes affecting particle acceleration and complex dynamics of space
storms. Macroprocess and microprocess simulations, which can be compared with observations, are also important for the quantitative understanding of the causal relationships. Several physical models of the inner magnetosphere,
such as the GEMSIS ring current model [Amano et al., 2011], the GEMSIS radiation belt model [S. Saito et al., 2010], and a PIC simulation for chorus waves [Hikishima et al., 2009], have been
newly developed in Japan and will be compared with observation data from the ERG project.
The science coordination team promotes close collaborations between the satellite observation team, the ground-based network observation team, and the integrated data analysis/simulation team as well as collaborations with other related satellite missions and international programs.
The ERG Science Center is developing integrated analysis tools for all kinds of project data in cooperation with the THEMIS project [Angelopoulos, 2008] and the Inter-university Upper Atmosphere Global Observation NETwork (IUGONET) project in Japan.
Manager: Yoshizumi Miyoshi (ISEE, Nagoya University)
Submanager: Tomoaki Hori (ISEE, Nagoya University)
The ERG (Exploration of energization and Radiation in Geospace) project is a mission to elucidate acceleration and loss mechanisms of relativistic electrons around Earth during geospace storms. The project consists of the satellite observation team,
the ground-based network observation team, and the integrated data analysis/simulation team.
The ERG Science Center is operated by Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) and Institute for Space-Earth Environmental Research (ISEE), Nagoya University as a Joint Research Center for Space Science.
The science center archives data related to the ERG project, releases the data to the public, develops integrated analysis tools for the data, and promotes studies related to the ERG project.