Analysis of the solar O II/O III multiplets at 834 A - Implications for the emission measure distribution in the vicinity of 40,000 K

Details Analysis of the solar O II/O III multiplets at 834 A - Implications for the emission measure distribution in the vicinity of 40,000 K Analysis of the solar O II/O III multiplets at 834 A - Implications for the emission measure distribution in the vicinity of 40,000 K

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..570m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 570-573.

Astronomy and Astrophysics

Astrophysics

12

Chromosphere, Line Spectra, Oxygen Spectra, Solar Spectra, Emission Spectra, Solar Atmosphere

Scientific paper

A previously unpublished very high resolution solar spectrum has been analyzed to determine the relative contributions of O II and O III at 834 Å. The resulting ratio of O II to O III emissions is found to be 0.35, which is lower than derived from lower resolution data or expected from calculations based on standard emission measure theory. In order to reproduce the ratio observed in the high-resolution spectrum, it is proposed to lower the emission measure in the vicinity of 40,000 K by a factor of 2. This would also reconcile differences among apparently discrepant lines of C II and is consistent with the physical interpretation that the emission measure between 104 and 105 K is comprised of components arising from physically different regimes in the solar atmosphere.

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