description Arase Overview
Arase, formerly known as the Exploration of Energization and Radiation in Geospace (ERG), is a Japanese scientific satellite operated by JAXA. Launched in 2016, it was designed to study the Earth's inner magnetosphere, including the Van Allen radiation belts and the processes that accelerate high-energy particles. Its instruments measure charged particles, plasma waves, and electric and magnetic fields. The mission is intended for research on wave-particle interactions and space-weather physics.
help Arase FAQ
What is Arase?
Arase is the Japanese scientific satellite formerly known as ERG, or Exploration of Energization and Radiation in Geospace. It was developed and operated by JAXA to study Earth's inner magnetosphere.
When was Arase launched?
Arase was launched on December 20, 2016, from the Uchinoura Space Center in Kagoshima, Japan. It was carried into space by an Epsilon rocket.
What does Arase study?
The mission studies the Van Allen radiation belts and the processes that accelerate and remove energetic electrons. This helps researchers understand how geomagnetic storms affect near-Earth space.
Why was the satellite renamed from ERG to Arase?
ERG was the mission's original acronym, while Arase became its public nickname and mission name. The satellite's scientific purpose remained the study of energization and radiation in geospace.
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