Instruments
Spacecraft Instrumentation
The five spin-stabilized (spin period = 3 seconds) THEMIS probes carry the comprehensive packages of plasma and field instruments needed to determine the cause of geomagnetic substorms. The instruments being flown are:
Electric field instruments (EFI)
Fluxgate magnetometers (FGM)
Search coil magnetometers (SCM)
Electrostatic analyzers (ESA)
Solid state telescopes (SST)
Mechanical Drawings
Ground Based Instrumentation
The dedicated array of THEMIS ground observatories (20 all-sky imagers and 21 ground magnetometers) covers North America from Eastern Canada to Alaska, providing the information needed to place THEMIS probe observations within their global context. The ground observatories were up and fully operational prior to the launch of the THEMIS probes in February, 2007.
All-sky white light imagers (ASI)
Fluxgate magnetometers (GMAGS)
Other Fields Data
Digital Fields Board (DFB)-Filter Bank (FBK)-Fourier Power Spectra (FFT)
On-board Spin Fits (FIT) from EFI and FGM Instruments
Instrument Configuration History
Filter Bank (FBK) Signal Source Selections
Fourier Power Spectra (FFP, FFW, FFF) Signal Sources, Frequency Bin Counts, Cadence