IMAGE's Medium 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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