The Inner Magnetosphere Explorer (IMEX) was selected as one of the first missions of the NASA University-Class Explorers Program.

The principal investigator is Professor John R. Wygant of the University of Minnesota.




[News Coverage]

IMEX Mission

IMEX Personnel

Principal Investigator

John Wygant University of Minnesota

Project Manager:

Keith Goetz University of Minnesota

Education and Outreach:

Cynthia Cattell University of Minnesota
Randi Quanbeck Minnesota Space Grant Consortium


Cynthia Cattell University of Minnesota
Paul Kellogg University of Minnesota
Keith Goetz University of Minnesota
Daniel Baker University of Colorado - Boulder
Xinlin Li University of Colorado - Boulder
J. B. Blake Aerospace Corporation
James Clemmons Aerospace Corporation
Joseph Fennell Aerospace Corporation
Michael Coplan University of Maryland
John H. Moore University of Maryland
James McFadden University of California - Berkeley
Michael Temerin University of California - Berkeley
Mario H. Acuna NASA/Goddard Space Flight Center
Mary K. Hudson Dartmouth College
Manuel Grande Rutherford Appleton Laboratory
Cheri Morrow Space Science Institute

Spacecraft Instruments and Information

(for more information check out the science section of the IMEX proposal)

  • FIELDS - University of Minnesota

    • double probe instrument measures DC to 20 Hz electric fields between .05-500 mV/m
    • samples up to 40 kHz electric fields in burst mode between .01-100 mV/m
    • search coils measure 1pT to 3nT magnetic fields in burst mode between 100 Hz and 20 kHz
    • Langmuir probe mode measures plasma density and temperature with 5 minute resolution
      (in addition to spacecraft potential measurements which measure thermal electron flux with 0.5 s resolution)

  • Fluxgate Magnetometer - Goddard Space Flight Center

    • provides up to 20 Hz magnetic field measurements from .016-64000 nT

  • HEPEX (High Energy Particle Experiment) - Aerospace Corporation

    • Ring Current Ion Sensor (RIS)

      • Magnetic spectrograph
      • measures 2D distributions of 30-500 keV hydrogen and 50-500 keV oxygen (also some measurements of helium) with 3 s resolution

    • Energetic Electron Spectrograph (EES)

      • Magnetic spectrograph
      • measures 2D distributions of 10 keV to 1.5 MeV electrons with 3 s resolution

    • Relativistic Electron Detectors (RED)

      • Set of 5 threshold sensors
      • measures omnidirectional flux of 2-15 MeV electrons (1 s resolution)
      • measures omnidirectional flux of 20-100 MeV protons (1 s resolution)

  • 3-D LEPA - UC Berkeley

    • Electrostatic analyzers
    • Measures 3D distributions of ~3 eV to 30 keV electrons and ions with spin period (~6 s) resolution

This is the latest concept for the design of the IMEX spacecraft (3/24/99).
The view shown here is the dark side of the spacecraft. The solar panels are on the sunlit side "underneath".
For more images, including a view of IMEX piggybacking on the Inertial Upper Stage, go here.

News Coverage of the IMEX Mission

Other IMEX Websites:

Magnetospheric Physics on the WWW:

[IMEX] [CRRES] [FAST] [Geotail] [Polar] [Ulysses] [Wind]

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Last Updated : Feb 25, 1999

This page is maintained by Doug Rowland.