BackForward Satellite: THEMIS (5 sats) 

Satellite details
Acronym THEMIS (5 sats)
Full name Time History of Events and Macroscale Interactions during Substorms
Satellite Description
  • Constellation of 5 satellites flown across the Magnetosphere.
  • Main mission: Space weather, magnetosphere processes.
  • Orbits with perigees in the range 7,100-9,500 and apogees in the range 64,000-202,000 km.
Mass at launch 126 kg Dry mass 77 kg
Power 41 W
Data access link no link provided
Data access information
  • Data are available from the Space Sciences Laboratory (SSL), Berkeley.
Orbit Cross-magnetosphere orbit Altitude
Inclination 6 °


Space agency NASA
Status Unclear
Details on Status
(as available)
  • On 20 September 2009 the two most external satellites were moved towards lunar orbits to implement the ARTEMIS mission.
Launch 17 Feb 2007 EOL ≥2020
Last update: 2019-12-29
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 THEMIS (5 sats)

Acronym Full name
FGM Fluxgate Magnetometer
ESA Electrostatic Analyzer
SST Solid State Telescope
SCM Search Coil Magnetometer
EFI Electric Field Instrument
Show instrument status and calibration