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RHESSI/RESIK Observations of the Fe (6.7keV) and Fe/Ni (8keV) Solar Flare Lines

K.J.H.Phillips, B.R.Dennis and C. Chifor

abstract: The solar flare 4--10 keV (1-3 A) X-ray spectrum is ideal for diagnosing the hottest part of the flare plasma. RHESSI and RESIK observations of the Fe (6.7keV) and Fe/Ni (8keV) features have been analyzed to give Fe abundances in flare plasmas which appear to be near-coronal (4 times photospheric) in most cases. An outline of DEM functions deduced from simultaneous GOES observations and their application to RESIK and RHESSI observations will also be given.

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