THEMIS studies how mass and energy move through the near-Earth space environment to determine the physical processes initiating auroras.It is comprised of five satellites spread out in Earth’s magnetotail.
APL, IGEP, IWF, LPP, CESR, LASP, NOAA, UCLA, U of Calgary, U of St. Petersberg Russia, MPAE, National Observatory of Athens, ISAS/JAXA, ESA/ESTEC, SECS,
Dr. Vassilis Angelopoulos
THEMIS was launched 2007. In 2010, two of its five spacecraft were repurposed as ARTEMIS and moved to a new location to study similar processes closer to the Moon.