Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..473a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 473-482.
Astronomy and Astrophysics
Astronomy
Far Ultraviolet Radiation, Satellite Observation, Solar Activity Effects, Solar Limb, Solar Radiation, Spectroheliographs, Optical Thickness, Oso-4, Satellite-Borne Instruments, Solar Atmosphere, Spaceborne Astronomy
Scientific paper
OSO 4 spectroheliograms have been analyzed for intensities and fluxes of the quiet sun (Q) and active regions (AR) in 44 EUV lines from 29 atoms or ions. The flux ratios agreed well with earlier independent estimates. Limb brightening was always less than that expected from an optically thin solar atmosphere. There was no limb brightening for optically thick lines. Flux measurements made on 22 plages in 18 spectral lines gave rise to some quantitative relations between EUV fluxes and McMath plage indices. Emission measures in volume and height forms have been determined, and ratios of active-region to quiet-sun height emission measures are computed as a function of maximizing temperature.
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