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Ultraviolet spectroscopy of the extended solar corona

Kohl, John L.; Noci, Giancarlo; Cranmer, Steven R. +1 more

The first observations of ultraviolet spectral line profiles and intensities from the extended solar corona (i.e., more than 1.5 solar radii from Sun-center) were obtained on 13 April 1979 when a rocket-borne ultraviolet coronagraph spectrometer of the Harvard-Smithsonian Center for Astrophysics made direct measurements of proton kinetic temperatu…