Diagnostic application of highly ionized iron lines in the XUV spectrum of a solar flare |
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| Authors: | H E Mason A K Bhatia S O Kastner W M Neupert M Swartz |
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| Institution: | (1) Department of Applied Mathematics and Theoretical Physics, Silver Street, CB3 9EW Cambridge, Great Britain;(2) NASA/Goddard Space Flight Center, 20771 Greenbelt, MD, U.S.A.;(3) Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada |
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| Abstract: | 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 90–200 Å strong lines from each of the ions Fe xviii-Fe xxiv. The Fe xxi lines can be used as an electron density diagnostic for the 107 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 × 1011 cm–3 at 107 K. We 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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