Satellites and Spacecraft Exploration of energization and Radiation in Geospace "ARASE" (ERG)

In Operation

Project Topics

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Jan. 23, 2017 Updated

Arase critical operation phase successfully completed!

Arase critical operation phase successfully completed!

JAXA confirmed completion of the critical operations phase of Arase (ERG), Exploration of energization and Radiation in Geospace. It results from a sequence of significant tasks that occurred as anticipated: perigee up maneuvers and extension of its wire antennae and masts. Arase is currently in good condition and is scheduled to enter into a two-month commissioning phase, then followed by a science operations phase. ...

About Exploration of energization and Radiation in Geospace "ARASE" (ERG)

To elucidate high-energy electrons that repeat their generation and disappearance.

Geospace is the region of outer space near the Earth. The radiation belt called the "Van Allen radiation belt" lies within the geospace, and the belt captures a huge volume of highly charged energy particles that exceed mega electron volts.
This project aims at elucidating how highly charged electrons have been born while they generate and vanish repeatedly along with space storms caused by the disturbance of solar wind caused by space storms, and how space storms are developed.

Major Characteristics

Name Exploration of energization and Radiation in Geospace (ERG)
Launch Date December 20, 2016 (JST)
Location Uchinoura Space Center (USC)
Launch Vehicle Epsilon-2
Configuration Weight about 350kg
Orbit Altitude Perigee: about 300 km, Apogee: about 33,200 km
Inclination about 31°
Type of Orbit Elliptical orbit
Period about 580min.
Satellite bus SPRINT bus
Major Scientific Instruments (Scheduled) Extremely high-energy electron experiments (XEP-e)
High-energy electron experiments (HEP-e)
Medium-energy particle experiments - electron analyzer (MEP-e)
Low-energy particle experiments - electron analyzer (LEP-e)
Medium-energy particle experiments - ion mass analyzer (MEP-i)
Low-energy particle experiments - ion mass analyzer (LEP-i)
Magnetic field experiment (MGF)
Plasma wave experiment (PWE)
Software-type wave particle interaction analyzer (S-WPIA)

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