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Equatorial airglow and the ionospheric geomagnetic anomaly.Ogo 4 observations of the O I (6300-A) emissions have revealed a global pattern hitherto undetected from the ground-based observations. It is seen that the postsunset emission of O I (6300 A) in October 1967 is very asymmetrical with respect to the geomagnetic equator in certain longitude regions and shows poor correlation with the electron density measured simultaneously from the same spacecraft. This asymmetry is less marked in the UV airglow, O I (1356 A), which appears to vary as the square of the maximum electron density in the F region. The horizon scan data of the 6300-A airglow reveal that the latitudinal asymmetry is associated with asymmetry in the height of the O I (6300-A) emission and hence with the altitude of the F2 peak. From the correlative studies of the airglow and the ionospheric measurements the mechanisms of the UV and the 6300 A emissions are discussed in terms of the processes involving radiative and dissociative recombination. Theoretical expressions are developed which relate the airglow data to the ionospheric parameters.
Document ID
19730054137
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chandra, S.
Reed, E. I.
Troy, B. E., Jr.
(NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Blamont, J. E.
(CNRS, Service d'Aeronomie, Verrieres-le-Buisson Essonne, France)
Date Acquired
August 7, 2013
Publication Date
August 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Report/Patent Number
NSSDC-ID-67-073A-13-OM
NSSDC-ID-67-073A-12-PM
NSSDC-ID-67-073A-19-PM
Accession Number
73A38939
Distribution Limits
Public
Copyright
Other

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