BackForward Satellite: Arase (ERG) 

Satellite details
Acronym Arase (ERG)
Full name Exploration of energization and Radiation in Geospace
WIGOS Station Identifier ---
Satellite Description
  • Single satellite of the ERG programme, known as "Arase" in Japanese originally ERG.
  • Main mission:Space weather, particularly in the magnetosphere and across the Van Allen belts.
  • Highly-elliptical Earth Orbit (HEO), with perigee 300 km and apogee 30,000 km
Mass at launch 350 kg Dry mass
Data access link no link provided
Data access information
  • TBD.
Orbit Cross-magnetosphere orbit Altitude 3000 km
Inclination 31 °


Space agency JAXA
Status Operational
Details on Status
(as available)
Launch 20 Dec 2016 EOL ≥2033
Last update: 2023-04-27
Associated satellite programme and related satellites

Note: red tag: no longer operational , green tag: operational , blue tag : future

Satellite Payload

All known Instruments flying on Arase (ERG)

Acronym Full name
LEP-e Low-energy particle experiments - electron analyzer
MEP-e Medium-energy particle experiments - electron analyzer
HEP-e High-energy electron experiments
XEP-e Extremely high-energy electron experiments
LEP-i Low-energy particle experiments - ion mass analyzer
MEP-i Medium-energy particle experiments - ion mass analyzer
MGF Magnetic field experiment
PWE Plasma Wave Experiment
Show instrument status and calibration