Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199l..67f&link_type=abstract
Astrophysical Journal, vol. 199, July 1, 1975, pt. 2, p. L67-L70. NASA-supported research.
Astronomy and Astrophysics
Astronomy
24
H Alpha Line, Helium Ions, Skylab Program, Solar Spectra, Luminous Intensity, Molecular Collisions, Radiative Recombination, Solar Corona, Spaceborne Astronomy, Spectroheliographs
Scientific paper
Profiles obtained from NRL Skylab solar spectra of the 1640.4 A feature identified as the H-alpha line of He II are discussed and compared with theoretical profiles derived assuming (1) collisional excitation and (2) radiative recombination as the dominant excitation mechanism. Relative intensities of this line as a function of altitude above and below the solar white-light limb are also given for a representative quiet sun region and for a polar coronal hole.
Doschek George A.
Feldman Uri
Tousey Richard
Vanhoosier Michael E.
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