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A collection of spectral energy distributions (SEDs) is available in theHubble Space Telescope (HST) CALSPEC database that is based on calculated modelatmospheres for pure hydrogen white dwarfs (WDs). A much larger set (~100,000)of UV SEDs covering the range (1150-3350A) with somewhat lower quality areavailable in the IUE database. IUE low-dispersion flux distributions arecompared with CALSPEC to provide a correction that places IUE fluxes on theCALSPEC scale. While IUE observations are repeatable to only 4-10% in regionsof good sensitivity, the average flux corrections have a precision of 2-3%. Ourre-calibration places the IUE flux scale on the current UV reference standardand is relevant for any project based on IUE archival data, including ourplanned comparison of GALEX to the corrected IUE fluxes. IUE SEDs may be usedto plan observations and cross-calibrate data from future missions, so the IUEflux calibration must be consistent with HST instrumental calibrations to thebest possible precision.

A Correction for IUE UV Flux Distributions from Comparisons with CALSPEC