Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l.117k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Oct. 15, 1980, p. L117-L121. Research supported by the Smithson
Astronomy and Astrophysics
Astrophysics
37
Coronal Holes, Solar Corona, Solar Temperature, Solar Wind, Coronagraphs, Lyman Alpha Radiation, Rocket-Borne Instruments, Solar Spectra, Spectral Line Width
Scientific paper
A rocket-borne Lyman-alpha coronagraph has been used to make the first measurements of the spectral line profile of resonantly scattered hydrogen Lyman-alpha coronal radiation between 1.5 and 3 solar radii. These data provide, for the first time, direct measurements of coronal temperatures above 1.5 solar radii. Data were obtained in a coronal hole, quiet region, and streamer. The widths of the profiles from the quiet region decrease with height and correspond to a steady decrease in hydrogen kinetic temperature, with increasing radius, from about 2.5 million K at r = 2 solar radii to about 1 million K at r = 9 solar radii. In the coronal hole the measured line widths indicate a kinetic temperature of 1.8 million K at r = 2.5 solar radii.
Kohl John L.
MacQueen Robert M.
Munro Richard Harding
Noyes Robert W.
Parkinson William H.
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