Energy Neutral Atom
(MENA) imager is a slit-type imager designed to detect energetic neutral
hydrogen and oxygen atoms with energies ranging from 1 to 30
keV. The instrument determines the time of flight and incidence
angle of the incoming ENAs; from these raw data it calculates their
trajectory and velocity and generates images of the
magnetospheric regions from which they are emitted. As shown in
the figure on the right, the imager consists of three identical sensor heads
mounted on a data processing unit (DPU). The MENA lead investigator is C. J.
Pollock of Southwest Research Institute; the MENA sensor
concept was developed by IMAGE co-investigator D. J. McComas of the
Los Alamos National Laboratory.
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