Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...169..319k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 169, no. 1-2, Nov. 1986, p. 319-322. SERC-supported research.
Astronomy and Astrophysics
Astrophysics
20
Emission Spectra, Ion Temperature, Sodium, Solar Electrons, Solar Spectra, Aluminum, Silicon, Spectral Energy Distribution
Scientific paper
Recent R-matrix calculations of electron excitation rates for the Na-sequence ions Al III and Si IV are used to determine theoretical emission line ratios applicable to the solar transition region. A comparison of the Al III results with high resolution (≅0.06 Å) solar data obtained with the NRL S082-B spectrograph on board Skylab shows reasonable agreement between theory and observations. However a similar analysis for Si IV using low resolution (≅2 Å) EUV satellite spectra for the quiet sun and an active region reveals that the calculations and observational data are incompatible. It is shown that this is probably due to the Si IV 3d2D3/2 - 3p2P1/2 and 3d2D3/2,5/2 - 3p2P3/2 transitions at 1122.5 Å and 1128.3 Å respectively being blended with lines arising from ions with relatively low ionization potentials.
Dufton Philip L.
Keenan Francis P.
Kingston A. E.
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