JAXA Japan Aerospace Exploration Agency

	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.

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.

Project Topics

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Mar. 29, 2017 Updated

Arase off to Science Operations Phase

	JAXA confirmed completion of the commissioning phase of ARASE, formerly known as ERG, Exploration of energization and Radiation in Geospace. ARASE has entered its science operations phase. The call was made as the following procedure took place as scheduled and was confirmed; the satellite post launch orbital systems are in place, their functions are determined as fine, all monitoring instruments are installed, and the motions of the monitoring equipment are checked. ARASE is in good condit... More to read

JAXA confirmed completion of the commissioning phase of ARASE, formerly known as ERG, Exploration of energization and Radiation in Geospace. ARASE has entered its science operations phase. The call was made as the following procedure took place as scheduled and was confirmed; the satellite post launch orbital systems are in place, their functions are determined as fine, all monitoring instruments are installed, and the motions of the monitoring equipment are checked. ARASE is in good condit...

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Press Release

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Nov. 12, 2020 (14:00) [release]

Killer electrons in strumming sky lights
Jan. 23, 2017 (18:00) [release]

Completion of Exploration of energization and Radiation in Geospace Arase (ERG)’s Critical Operations Phase

Major Characteristics

Name		Exploration of energization and Radiation in Geospace "ARASE" (ERG)
Launch	Date	December 20, 2016 (JST)
	Location	Uchinoura Space Center (USC)
	Launch Vehicle	Epsilon-2
Configuration	Weight	about 350kg
Orbit	Altitude	Perigee: about 440 km, Apogee: about 32,000 km
	Inclination	about 32°
	Type of Orbit	Elliptical orbit
	Period	about 570min.
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)