Arase (satellite)

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Arase (satellite)

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.

Quick Facts Mission type, Operator ...
Arase
Thumb
Artistic rendering of Arase in orbit.
Mission typeEarth observation
OperatorJAXA
COSPAR ID2016-080A
SATCAT no.41896
Mission duration8 years, 4 months and 4 days (elapsed)
Spacecraft properties
BusSPRINT
Launch mass~350 kg
Power≧700 W
Start of mission
Launch date11:00, 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 [1]
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)
Close

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.[2]

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.[3] Once in orbit, it will extend four solar panels, two 5 m masts, and four 15 m wire antennas.[3] The spacecraft is spin-stabilized at 7.5 rpm (8 seconds).[3]

Planned mission duration was for one year of scientific observation, [3] 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.[4]

Instruments

Arase carries following instruments:[3]

  • XEP-e (Extremely high-energy electron sensor)[5]
  • 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.[3]

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).[3]

S-WPIA will analyse the data obtained by other instruments.[3]

See also

References

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