The IMAGE science objectives require the imaging of neutral atoms with energies ranging from 10 eV to 500 keV. In order to cover this extremely wide energy range, IMAGE must carry three very different neutral atom imagers, for low-energy, medium-energy, and high-energy neutral atoms, respectively. Capsule descriptions of each imager, with links to more detailed instrument descriptions, are given below.

(larger version of HENA photo)
High-Energy Neutral Atom (HENA) Imager

The HENA imager detects ENAs in the 10-500 keV energy range. HENA imaging focuses principally on the ring current, inner plasma sheet, and substorm injection boundary. HENA is a modified version of the Cassini INCA instrument, which will provide global images of ENA emissions from Saturn's magnetospheric ion populations. The HENA lead investigator is Donald G. Mitchell, of the Applied Physics Laboratory. (Detailed instrument description)


(larger version of MENA photo)
Medium-Energy Neutral Atom (MENA) Imager

The MENA instrument detects ENAs in the energy range 1-30 keV. Like HENA, MENA provides images of the ring current, near-Earth plasma sheet, and the nightside injection boundary. In addition, it images the ion populations of the cusp. The lead investigator for the MENA experiment is Craig J. Pollock, of Southwest Research Institute. (Detailed instrument description)

Low-Energy Neutral Atom (LENA) Imager

The LENA instrument detects ENAs with energies between 10 eV and 500 eV. LENA's primary role is to image the outflow of low-energy ions from the polar ionosphere. Thomas E. Moore, of the NASA Goddard Space Flight Center, is the lead investigator for the LENA experiment. (Visit the LENA web site at GSFC.)


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