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Extreme ultraviolet composite spectra of representative solar features
Vernazza, J. E.; Reeves, E. M.
AA(Harvard College Observatory and Smithsonian Astrophysical Observatory, Center for Astrophysics, Cambridge, Mass.), AB(Harvard College Observatory and Smithsonian Astrophysical Observatory, Center for Astrophysics, Cambridge, Mass.)
Astrophysical Journal Supplement Series, vol. 37, Aug. 1978, 485-513. (ApJS Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Far Ultraviolet Radiation, Line Spectra, Solar Spectra, Spectrum Analysis, Tables (Data), Ultraviolet Spectra, Astronomical Photometry, Solar Corona, Solar Cycles
Bibliographic Code:


The spectral identifications and absolute intensities of lines in the EUV spectrum for various solar features, such as the quiet sun, active regions, coronal holes, and the off-limb corona, are presented and discussed. Composite spectra have been assembled and processed from the ATM ultraviolet spectrometer data with a spectral resolution of 1.6 A over the range 280-1350 A. These spectra represent a self-consistent set of observations with good photometric calibration, in which intercomparison of intensities from different regions is used to assist in line identifications and to draw general conclusions on average physical conditions in the solar atmosphere. The quiet-sun line intensities obtained near solar minimum are compared with OSO 6 results near solar maximum to provide an estimate for the changes over the solar cycle.

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Database: Astronomy
arXiv e-prints