Recent atomic data have been used to analyze a solar flare spectrum obtained with the Goddard Space Flight Center's grating spectrometer on the OSO-5 satellite. There exist in the wavelength region 90-2011 )i strong lines from each &the ions Fexvln-Fexxtv. The Fexxx lines can b,z used as an electron density diagnostic for the 10 7 K plasma. From our analysis of a particular flare, we find a steep positive slope in the emission measure between 106.5 and 107.2 K and an electron density of ~ 4 x 10 ~ cm-3 at 10 7 K. Wc emphasise the need for high spectral and spatial resolution observations of solar flares in this wavelength region, which has to date been largely neglected.

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