The SPEAR Instrument and On-Orbit Performance

The SPEAR (or "FIMS") instrumentation has been used to conduct the first large-scale spectral mapping of diffuse cosmic far-ultraviolet (FUV; 900-1750 A) emission, including important diagnostics of interstellar hot (104-106 K) and photoionized plasmas, H2, and dust-scattered starlight. The instrumentation's performance has allowed for the unprecedented detection of astrophysical diffuse FUV emission lines. A spectral resolution of λ/Δλ ~ 550 and an imaging resolution of 5' is achieved on-orbit in the Short (900-1150 A) and Long (1350-1750 A) bandpass channels within their respective 40 × 46 and 74 × 43 fields of view. We describe the SPEAR imaging spectrographs, their performance, and the nature and handling of their data.

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