Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29g..63d&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 7, pp. 63-1, CiteID 1159, DOI 10.1029/2001GL014232
Astronomy and Astrophysics
Astrophysics
1
Solar Physics, Astrophysics, And Astronomy: Ultraviolet Emissions, Ionosphere: Solar Radiation And Cosmic Ray Effects, Magnetospheric Physics: Instruments And Techniques, And Astronomy: Transition Region
Scientific paper
I present quiet Sun solar disk averaged emission line intensities (at the Earth) and the full widths at half maximum intensity (FWHM) for the O+ and O++ emission lines that fall near 834 Å. These lines are important as excitation sources for O+ and O++ emission in the Earth's upper ionosphere, plasmasphere and magnetosphere. I also discuss the variation of the ratio of O+ to O++ emission as a function of solar spatial fine structure in the quiet Sun. The spectra were obtained from the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer flown on the Solar and Heliospheric Observatory spacecraft. There are five O+ and O++ features in the solar spectrum involving nine spectral lines. The peak quiet Sun intensities (in units of 109 photons cm-2 s-1 Å-1) of these features and their approximate centroid wavelengths are: 0.717, 832.85 Å 0.717, 833.30 Å 1.76, 833.74 Å 1.16, 834.45 Å and 2.68, 835.29 Å. The average O+ and O++ FWHMs are 0.177 Å and 0.179 Å, respectively. The difference in widths is not significant.
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