Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...442..898w&link_type=abstract
Astrophysical Journal (ISSN 0004-637X), vol. 442, no. 2, Part 1, p. 898-906
Astronomy and Astrophysics
Astronomy
6
Chromosphere, Lyman Alpha Radiation, Lyman Spectra, Occultation, Solar Spectra, Stellar Models, Ultraviolet Spectra, Astronomical Spectroscopy, Data Reduction, Mathematical Models, Spaceborne Astronomy, Spectrum Analysis, Temporal Distribution, Ultraviolet Astronomy, Upper Atmosphere Research Satellite (Uars), Variability
Scientific paper
Solar Ly-alpha irradiance measurements from the SOLar STellar Irradiance Comparison Experiment (SOLSTICE) on the Upper Atmosphere Research Satellite (UARS) have been made since 1991 October with a spectral resolution of 0.1 nm. The uniqueness of the small molecular oxygen cross section near Ly-alpha permits the Ly-alpha radiation to penetrate much deeper into the atmosphere than the other emissions near Ly-alpha. We have taken advantage of this phenomenon by performing solar occultation experiments near the Ly-alpha to evaluate precisely the instrument scattered light contribution. After correcting for scattered light, the broad wings of the solar Ly-alpha line can be extracted out to 5 nm from line center with a typical accuracy of +/-20%. The variability in the Ly-alpha wings near 2 nm from line center is about one-half that of the Ly-alpha core emission, defined within 0.1 nm from line center. These Ly-alpha profile measurements are found to be consistent with the Skylab radiance measurements and theoretical models of the Ly-alpha line profiles computed using partial redistribution of photons in the source function.
Avrett Eugene H.
Fontenla Juan
Rottman Gary J.
White Oran Richard
Woods Thomas N.
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