Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...691l..77y&link_type=abstract
The Astrophysical Journal Letters, Volume 691, Issue 2, pp. L77-L81 (2009).
Astronomy and Astrophysics
Astronomy
15
Atomic Data, Line: Identification, Sun: Corona, Sun: Uv Radiation
Scientific paper
Four Fe IX transitions in the wavelength range 188-198 Å are identified for the first time in spectra from the EUV Imaging Spectrometer on board the Hinode satellite. In particular the emission line at 197.86 Å is unblended and close to the peak of the EIS sensitivity curve, making it a valuable diagnostic of plasma at around 800,000 K — a critical temperature for studying the interface between the corona and transition region. Theoretical ratios among the four lines predicted from the CHIANTI database reveal weak sensitivity to density and temperature with observed values consistent with theory. The ratio of λ197.86 relative to the λ171.07 resonance line of Fe IX is found to be an excellent temperature diagnostic, independent of density, and the derived temperature in the analyzed data set is log T = 5.95, close to the predicted temperature of maximum ionization of Fe IX.
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