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Twilight airglow. I - Photoelectrons and forbidden O I 5577-angstrom radiation.A payload consisting of a number of experiments to study the earth's atmosphere was launched from White Sands on Feb. 8, 1971. The differential photoelectron flux spectrum was measured as a function of altitude. The energy distribution revealed the N2 vibrational structure appearing at 2.8 V, rising to a maximum at 4 eV, decreasing to an 8-volt-wide plateau at 20 V, and then further decreasing. The ion and electron density distributions were measured simultaneously. An optical measurement of forbidden O I 5577-A radiation was made. Both electron impact on atomic oxygen and dissociative recombination of O2(+) were found to produce this emission above 150 km. The recombination rate for the O(1 S) found from a reported nightglow profile is 2.5 plus or minus 1.5 x 10 to the minus 9th cu cm/sec. Between 140 and 120 km, photodissociation is a source of 5577 radiation. Chapman three-body recombination is dominant below 120 km.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Hays, P. B.
Sharp, W. E.
(Michigan, University Ann Arbor, Mich., United States)
Date Acquired
August 7, 2013
Publication Date
March 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Accession Number
Funding Number(s)
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