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Arase (satellite)

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(Redirected from Exploration of Energization and Radiation in Geospace)
Arase
Artistic rendering of Arase in orbit.
Mission typeEarth observation
OperatorJAXA
COSPAR ID2016-080A Edit this at Wikidata
SATCAT no.41896
Mission duration8 years (elapsed)
Spacecraft properties
BusSPRINT
Launch mass~350 kg
Power≧700 W
Start of mission
Launch date11:00:00, December 20, 2016 (UTC) (2016-12-20T11:00:00Z)
RocketEpsilon
Launch siteUchinoura
Orbital parameters
Reference systemGeocentric
Perigee altitude~460 km
Apogee altitude~32110 km
Inclination~31 degrees
Period~565 minutes
Instruments
  • Extremely high-energy electron sensor (XEP-e)
  • High-energy particle sensor – electron (HEP-e)
  • Medium-energy particle sensor – electron (MEP-e)
  • Low-energy particle sensor – electron (LEP-e)
  • Medium-energy particle – ion (MEP-i)
  • Low-energy particle – ion (LEP-i)
  • Magnetic Field Experiment (MGF)
  • Plasma Wave Experiment (PWE)
  • Software Wave-Particle Interaction Analyzer (S-WPIA)

Arase, formerly known as Exploration of energization and Radiation in Geospace (ERG), is a scientific satellite to study the Van Allen belts. It was developed by the Institute of Space and Astronautical Science of JAXA. While there was a scientist working on a similar project with the surname Arase, the satellite's name has nothing to do with him but instead named after a river beside the launch point.

It was launched aboard Epsilon launch vehicle at 11:00:00, 20 December 2016 UTC into apogee height 32250 km, perigee 214 km orbit. Subsequent perigee-up operation moved its orbit to apogee 32110 km, perigee 460 km of 565 minutes period.

Spacecraft

The Arase spacecraft is the second satellite based on SPRINT bus, after Hisaki (SPRINT-A). Arase weighs about 350 kg, measures about 1.5 m × 1.5 m × 2.7 m at launch. Once in orbit, it will extend four solar panels, two 5 m masts, and four 15 m wire antennas. The spacecraft is spin-stabilized at 7.5 rpm (8 seconds).

Planned mission duration was for one year of scientific observation, but the mission remains active over 5 years later.

Launch

Arase's launch on the enhanced Epsilon's maiden flight was originally scheduled for 2015, but was postponed to the 2016 financial year due to satellite development delays.

Instruments

Arase carries following instruments:

  • XEP-e (Extremely high-energy electron sensor)
  • HEP-e (High-energy particle sensor – electron)
  • MEP-e (Medium-energy particle sensor – electron)
  • LEP-e (Low-energy particle sensor – electron)
  • MEP-i (Medium-energy particle – ion)
  • LEP-i (Low-energy particle – ion)
  • MGF (Magnetic Field Experiment)
  • PWE (Plasma Wave Experiment)
  • S-WPIA (Software Wave-Particle Interaction Analyzer)

MGF is located at the end of 5 m extended mast.

PWE consists of a search coil (PWE-MSC) located at the end of another 5 m extended mast, four 15 m wire antennae (PWE-WPT), and associated electronics unit (PWE-E).

S-WPIA will analyse the data obtained by other instruments.

See also

References

  1. "Arase (ERG) Geospace Probe - JAXA". JAXA. Retrieved 2018-03-14.
  2. ジオスペース探査衛星「あらせ」（ERG）の軌道変更運用（近地点高度上昇）の完了について (in Japanese). JAXA. 13 January 2017. Retrieved 18 January 2017.
  3. ^ プレスキット/2016年11月18日（木） (PDF) (in Japanese). November 18, 2016. Archived from the original (PDF) on December 26, 2016. Retrieved November 27, 2016.
  4. Shogo Matsuda (16 January 2015). "Japan's Epsilon rocket shoved aside?". Nikkei Asian Review. Retrieved 6 February 2015.
  5. "Exploration of energization and Radiation in Geospace (ERG)". JAXA. 2012. Archived from the original on 2013-10-30. Retrieved 2013-09-08.

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