Why does IMAGE need so many kinds of ultraviolet 'imagers'?

The Far Ultraviolet images will primarily study auroral processes because there are several very bright 'auroral lines' in the wavelength range that the FUV imager is most sensitive. The Extreme Ultraviolet imager is most sensitive to the emission from helium ions in the larger-scale geocoronal region which is located above the auroral region. By studying the data from both imagers, space scientists will be able to see how particles and energy flow from the one scale to the other between the geocorona and the auroral zone.

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