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Analysis of coronal H I Lyman alpha measurements from a rocket flight on 1979 April 13It is noted that measurements of the profiles of resonantly scattered hydrogen Lyman-alpha coronal radiation have been used in determining hydrogen kinetic temperatures from 1.5 to 4 solar radii from sun center in a quiet region of the corona. Proton temperatures derived using the line widths decrease with height from 2.6 x 10 to the 6th K at 1.5 solar radii to 1.2 x 10 to the 6th K at 4 solar radii. These measurements, together with temperatures for lower heights determined from earlier Skylab and eclipse data, suggest that there is a maximum in the quiet coronal proton temperature at about 1.5 solar radii. Comparison of measured Lyman-alpha intensities with those calculated using a representative model for the radial variation of the coronal electron density yields information on the magnitude of the electron temperature gradient and suggests that the solar wind flow was subsonic for distances less than 4 solar radii.
Document ID
19820043841
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Withbroe, G. L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kohl, J. L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Weiser, H. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Noci, G. (Padova, Universita Padua, Italy)
Munro, R. H. (High Altitude Observatory Boulder, CO, United States)
Date Acquired
August 10, 2013
Publication Date
March 1, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-13998
CONTRACT_GRANT: NSG-7461
CONTRACT_GRANT: NSG-5128
Distribution Limits
Public
Copyright
Other