Limb-brightening observations from the OSO-7 satellite. II - Comparison of Abel-inverted intensities of Fe XIV and Fe XIII EUV emission lines with predictions

Details Limb-brightening observations from the OSO-7 satellite. II - Comparison of Abel-inverted intensities of Fe XIV and Fe XIII EUV emission lines with predictions Limb-brightening observations from the OSO-7 satellite. II - Comparison of Abel-inverted intensities of Fe XIV and Fe XIII EUV emission lines with predictions

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..203k&link_type=abstract

Astronomy and Astrophysics, vol. 53, no. 2, Dec. 1976, p. 203-212.

Astronomy and Astrophysics

Astrophysics

5

Far Ultraviolet Radiation, Iron, Satellite Observation, Solar Corona, Solar Limb, Spectroheliographs, Electron Density (Concentration), Electron Transitions, Emission Spectra, Limb Darkening, Line Spectra, Luminous Intensity, Metal Ions, Oso-7

Scientific paper

Intensities of Fe XIV and Fe XIII EUV emission lines obtained at coronal locations beyond the limb by the Goddard spectroheliograph on the OSO 7 satellite have been corrected for the wavelength dependence of the instrument's sensitivity and have been Abel-inverted to provide a valid comparison with theoretical predictions for each ion. Details of the Abel-inversion procedure are given, including explicit formulas for application of Bracewell's (1956) method. The intensity ratios of pairs of lines originating from a common level are compared with expected theoretical transition probability ratios over a range of heliocentric distance; deviations in some cases yield information about adjacent unclassified lines. Comparison of the observations with predictions for Fe XIV and Fe XIII shows generally good agreement, with a few interesting discrepancies that may imply a corresponding need for more accurate collisional excitation cross sections. The same comparison yields the variation of electron density with heliocentric radius for each ion separately; the two density functions are found to agree within a factor of three.

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