The IMAGE spacecraft carries three energetic neutral atom (ENA) imagers whose combined energy coverage permits the detection of ENAs with energies ranging from 1 eV to 500 keV (per atomic mass unit). Each neutral atom instrument generates images showing the intensity and spatial distribution of ENA emissions produced in the inner magnetosphere through charge exchange reactions between exospheric neutral hydrogen and various magnetospheric ion populations. These images are transmitted from the IMAGE spacecraft to Earth, where forward-modeling and image inversion techniques are used to translate them into images of the ion source populations. The images thus produced reveal the global morphology of inner magnetospheric plasma regions and document their dynamic response to changes in the solar wind. The particular focus of the IMAGE neutral atom imaging investigations is on the "hot" ion populations of the ring current and inner plasma sheet and on the outflow of "cooler," less energetic ions from the ionosphere.


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