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Detection of a corona of fast oxygen atoms during solar maximumA series of twilight interferometric observations of the near infrared O(+)(2P) doublets at 7320 and 7330 A between April 1979 and October 1979 detected excessive amounts of emission at shadow heights above 550 km. The scale height deduced from the vertical brightness profile determined from data taken on September 26, 1979, when the 10.7-cm flux was 231, showed a marked increase above 550 km. The equivalent temperature was estimated to be 4000 K or higher. Observations of the emission line shape with the high-resolution capability of the interferometer substantiated these results by a very apparent progressive broadening of the emission profile between times of low and high shadow height. It is concluded from these results that there exists an atomic oxygen corona overlying the thermosphere during the solar maximum period.
Document ID
19800060990
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yee, J. H.
(Michigan Univ. Ann Arbor, MI, United States)
Meriwether, J. W., Jr.
(Michigan Univ. Ann Arbor, MI, United States)
Hays, P. B.
(Michigan, University Ann Arbor, Mich., United States)
Date Acquired
August 10, 2013
Publication Date
July 1, 1980
Publication Information
Publication: Journal of Geophysical Research
Volume: 85
Subject Category
Solar Physics
Accession Number
80A45160
Funding Number(s)
CONTRACT_GRANT: NAS5-23006
CONTRACT_GRANT: NSF ATM-77-26889
Distribution Limits
Public
Copyright
Other

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