A Comparison of Theoretical Si <Emphasis Type="SmallCaps">VIII</Emphasis> Emission Line Ratios with Observations from Serts

Details A Comparison of Theoretical Si <Emphasis Type="SmallCaps">VIII</Emphasis> Emission Line Ratios with Observations from Serts A Comparison of Theoretical Si <Emphasis Type="SmallCaps">VIII</Emphasis> Emission Line Ratios with Observations from Serts

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..219..251k&link_type=abstract

Solar Physics, v. 219, Issue 2, p. 251-263 (2004).

Physics

1

Scientific paper

Recent R-matrix calculations of electron impact excitation rates in N-like Si VIII are used to derive theoretical emission line intensity ratios involving 2s 22p 3 2s2p 4 transitions in the 216 320 Å wavelength range. A comparison of these with an extensive dataset of solar active region, quiet-Sun, sub-flare and off-limb observations, obtained during rocket flights of the Solar EUV Research Telescope and Spectrograph (SERTS), indicates that the ratio R 1= I(216.94 Å)/I(319.84 Å) may provide a usable electron density diagnostic for coronal plasmas. The ratio involves two lines of comparable intensity, and varies by a factor of about 5 over the useful density range of 108 1011 cm-3. However R 2= I(276.85 Å)/I(319.84 Å) and R 3=I(277.05 Å)/I(319.84 Å) show very poor agreement between theory and observation, due to the severe blending of the 276.85 and 277.05 Å lines with Si VII and Mg VII transitions, respectively, making the ratios unsuitable as density diagnostics. The 314.35 Å feature of Si VIII also appears to be blended, with the other species contributing around 20% to the total line flux.

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