Image above: THEMIS spacecraft bus with instruments. Image Credit: NASA + Read More THEMIS INSTRUMENT SYSTEMS Instrument Data Processing Unit (IDPU) The IDPU houses most of the electronics for the instruments on the THEMIS spacacraft.
+ Read More Electric Field Instruments (EFI) The EFI is designed and built to sense the electric field in Earth's ever-changing magnetosphere  
+ Read More Flux Gate Magnetometer (FGM) The FGM measures the background meagnetic field to identify and time the abrupt reconfigurations of the magnetosphere during substorm onset.  
+ Read More Search Coil Magnetometers (SCM) The SCM measures low frequency magnetic field fluctuations and waves in three directions in Earth's magnetoshpere.  
+ Read More Electrostatic Analyzer (ESA) The ESA measures thermal electrons and ions to identify and track high-speed flows through the magnetotail and identify pressure pulses.  
+ Read More Solid State Telescope (SST) The SST measures particle distribution functions.
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Image above: THEMIS spacecraft instruments. Image Credit: NASA
GROUND BASED INSTRUMENTS Ground-Based All-Sky Imager (ASI) Array The ground-based All-Sky Imager (ASI) array observes the aurora over the Northern American continent from Canada to Alaska in order to determine where and when the auroral substorm onset occurs. 
+ Read More Ground-Based Magnetometer (GMAG) Array The GMAG Measure changes in Earth’s magnetic field near Earth’s surface due to substorm onset to help determine the timing of substorm events.
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