Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS)

The EMFISIS Accessing Data Product tutorial can be found here.

The EMFISIS SOC can be found here.

The EMFISIS investigation focuses on the important role played by magnetic fields and plasma waves in the processes of radiation belt particle acceleration and loss. EMFISIS provides data to understand the origin of important magnetospheric plasma waves as well as the evolution of the magnetic field that defines the basic coordinate system controlling the structure of the radiation belts and the storm-time ring current.

EMFISIS Science Investigation Objectives:

  • Differentiate among competing processes affecting the acceleration and transport of radiation particles
  • Differentiate among competing processes affecting the precipitation and loss of radiation belt particles
  • Quantify the relative contribution of adiabatic and non-adiabatic processes on energetic particles
  • Understand the effects of the ring current and other storm phenomena on radiation electrons and ions
  • Understand how and why the ring current and associated phenomena vary during storms

EMFISIS Instrument Suite:

Central Data Processing Unit (CDPU): Instrument control, spacecraft interface, on-board analysis, 512 Mbyte mass memory.

Tri-axial Magnetometer (MAG)
MAG is a tri-axial fluxgate magnetometer: Vector B, DC-30 Hz, 0.1 nT accuracy (in 4096 nT rnage), three sensors on rigid boom.

WAVES, a tri-axial search coil magnetometer, electric and magnetic field receivers and on-board FFT and wave normal processing.

Waves Components:

  • Magnetic field - vector B
    10 Hz - 12 kHz
    sensitivity: 3x10-11 nT2Hz-1 @ 1 kHz
    3 sensors on rigid boom
  • Electric field - spin-plane E
    10 Hz- 12 kHz (vector)
    10 kHz-400 kHz (single channel)
    sensitivity: 3x10-17 V2m-2Hz-1 @ 1 kHz
    signals supplied by the Electric Fields and Waves (EFW) Instrument

EMFISIS Data Products:


  • Magnetometer UVW - Magnetic field in spacecraft science coordinates


  • HFR Spectra -- Single axis frequency spectrogram between 10 kHz and 400 kHz
  • WFR Spectral Matrix -- Auto and Cross correlations between the 3 E field axes and 3 B field axes, Frequency range 2 Hz to 12 kHz.
  • WFR Waveforms -- Period full waveforms from all 3 electric and magnetic field axes.

For a more detailed description of the EMFISIS instrument visit http://emfisis.physics.uiowa.edu/about/instrument.