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Abstract: Four Fe IX transitions in the wavelength range 188-198 A are identified forthe first time in spectra from the EUV Imaging Spectrometer on board the Hinodesatellite. In particular the emission line at 197.86 A is unblended and closeto the peak of the EIS sensitivity curve, making it a valuable diagnostic ofplasma at around 800,000 K - a critical temperature for studying the interfacebetween the corona and transition region. Theoretical ratios amongst the fourlines predicted from the CHIANTI database reveal weak sensitivity to densityand temperature with observed values consistent with theory. The ratio of197.86 relative to the 171.07 resonance line of Fe IX is found to be anexcellent temperature diagnostic, independent of density, and the derivedtemperature in the analysed data set is log T=5.95, close to the predictedtemperature of maximum ionization of Fe IX.

Autor: P.R. Young


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